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Cobalt Drill Bit

Cobalt drill bits, made from heat resistant cobalt steel are heavy duty construction and made to NAS Type J aircraft specifications. Used for drilling holes in hard, tough materials such as stainless steel, titanium high temperature and high strength alloys. High red hardness of cobalt permits speeds 30% greater than HSS drills.

Products
Fractional Sizes
Wire Sizes
Letter Sizes
Drill Feeds & Speeds

Fractional Sizes

Fractional SizesCobalt Drill Bit

Size	Decimal Equivalent	Flute Length	Overall Length
1/16	0.0625	7/8	1 7/8
5/64	0.0781	1	2
3/32	0.0938	1 1/4	2 1/4
7/64	0.1094	1 1/2	2 5/8
1/8	0.1250	1 5/8	2 3/4
9/64	0.1406	1 3/4	2 7/8
5/32	0.1563	2	3 1/8
11/64	0.1719	2 1/8	3 1/4
3/16	0.1875	2 5/16	3 1/2
13/64	0.2031	2 7/16	3 5/8
7/32	0.2188	2 1/2	3 3/4
15/64	0.2344	2 5/8	3 7/8
1/4	0.2500	2 3/4	4
17/64	0.2656	2 7/8	4 1/8
9/32	0.2813	2 15/16	4 1/4
19/64	0.2969	3 1/16	4 3/8
5/16	0.3125	3 3/16	4 1/2
21/64	0.3281	3 5/16	4 5/8
11/32	0.3438	3 7/16	4 3/4
23/64	0.3594	3 1/2	4 7/8
3/8	0.3750	3 5/8	5
25/64	0.3906	3 3/4	5 1/8
13/32	0.4063	3 7/8	5 1/4
27/64	0.4219	3 15/16	5 3/8
7/16	0.4375	4 1/16	5 1/2
29/64	0.4531	4 3/16	5 5/8
15/32	0.4688	4 5/16	5 3/4
31/64	0.4844	4 3/8	5 7/8
1/2	0.5000	4 1/2	6

All dimensions are in inches.

Wire Sizes

Wire SizesCobalt Drill Bit

Size	Decimal Equivalent	Flute Length	Overall Length
1	0.2280	2 5/8	3 7/8
2	0.2210	2 1/2	3 7/8
3	0.2130	2 1/2	3 3/4
4	0.2090	2 1/2	3 3/4
5	0.2055	2 1/2	3 3/4
6	0.2040	2 1/2	3 3/4
7	0.2010	2 7/16	3 5/8
8	0.1990	2 7/16	3 5/8
9	0.1960	2 7/16	3 5/8
10	0.1935	2 7/16	3 5/8
11	0.1910	2 5/16	3 1/2
12	0.1890	2 5/16	3 1/2
13	0.1850	2 5/16	3 1/2
14	0.1820	2 3/16	3 3/8
15	0.1800	2 3/16	3 3/8
16	0.1770	2 3/16	3 3/8
17	0.1730	2 3/16	3 3/8
18	0.1695	2 1/8	3 1/4
19	0.1660	2 1/8	3 1/4
20	0.1610	2 1/8	3 1/4
21	0.1590	2 1/8	3 1/4
22	0.1570	2	3 1/8
23	0.1540	2	3 1/8
24	0.1520	2	3 1/8
25	0.1495	1 7/8	3
26	0.1470	1 7/8	3
27	0.1440	1 7/8	3
28	0.1405	1 3/4	2 7/8
29	0.1360	1 3/4	2 7/8
30	0.1285	1 5/8	2 3/4
31	0.1200	1 5/8	2 3/4
32	0.1160	1 5/8	2 3/4
33	0.1130	1 1/2	2 5/8
34	0.1110	1 1/2	2 5/8
35	0.1100	1 1/2	2 5/8
36	0.1065	1 7/16	2 1/2
37	0.1040	1 7/16	2 1/2
38	0.1015	1 7/16	2 1/2
39	0.0995	1 3/8	2 3/8
40	0.0980	1 3/8	2 3/8
41	0.0960	1 3/8	2 3/8
42	0.0935	1 1/4	2 1/4
43	0.0890	1 1/4	2 1/4
44	0.0860	1 1/8	2 1/8
45	0.0820	1 1/8	2 1/8
46	0.0810	1 1/8	2 1/8
47	0.0785	1	2
48	0.0760	1	2
49	0.0730	1	2
50	0.0700	1	2
51	0.0670	1	2
52	0.0635	7/8	1 7/8
53*	0.0595	7/8	1 7/8
54*	0.0550	7/8	1 7/8
55*	0.0520	7/8	1 7/8
56*	0.0465	3/4	1 3/4
57*	0.0430	3/4	1 3/4
58*	0.0420	11/16	1 5/8
59*	0.0410	11/16	1 5/8
60*	0.0400	11/16	1 5/8

*Not Split Point
All dimensions are in inches.

Letter Sizes

Letter SizesCobalt Drill Bit

Size	Decimal Equivalent	Flute Length	Overall Length
A	0.2340	2 5/8	3 7/8
B	0.2380	2 3/4	4
C	0.2420	2 3/4	4
D	0.2460	2 3/4	4
E	0.2500	2 3/4	4
F	0.2570	2 7/8	4 1/8
G	0.2610	2 7/8	4 1/8
H	0.2660	2 7/8	4 1/8
I	0.2720	2 7/8	4 1/8
J	0.2770	2 7/8	4 1/8
K	0.2810	2 15/16	4 1/4
L	0.2900	2 15/16	4 1/4
M	0.2950	3 1/16	4 3/8
N	0.3020	3 1/16	4 3/8
O	0.3160	3 3/16	4 1/2
P	0.3230	3 5/16	4 5/8
Q	0.3320	3 7/16	4 3/4
R	0.3390	3 7/16	4 3/4
S	0.3480	3 1/2	4 7/8
T	0.3580	3 1/2	4 7/8
U	0.3680	3 5/8	5
V	0.3770	3 5/8	5
W	0.3860	3 3/4	5 1/8
X	0.3970	3 3/4	5 1/8
Y	0.4040	3 7/8	5 1/4
Z	0.4130	3 7/8	5 1/4

All dimensions are in inches.

Drill Feeds & Speeds

Material	Hardness	Drill Type	Point Style	Point Angle	Speed (SFM)	Feed	Coolant
Aluminum / Aluminum Alloys	-	High Helix	Standard	118°	200-300	Medium to Heavy	Water Soluble
Aluminum Bronze	-	High Helix	Standard	118°	50-100	Medium to Heavy	Water Soluble
Brass, Free Machining	-	Low Helix	Standard	118°	100-250	Medium to Heavy	Water Soluble
Bronze, Soft Medium	Below 200	General Purpose	Standard	118°	70-150	Medium to Heavy	Water Soluble
Bronze, High Tensile	-	Low Helix or Half RD	Standard	118°	50-100	Medium to Heavy	Water Soluble
Copper / Copper Alloys	-	General Purpose	Standard	118°	100-200	Medium	Water Soluble
High Temp Alloys, Cobalt Base	180-300	Cobalt	Split Point	135°	5-20	Medium	Activated Oils
High Temp Alloys, Iron Base	180-300	Cobalt	Split Point	135°	5-20	Medium	Activated Oils
High Temp Alloys, Nickel Base	180-300	Nitro® or Cobalt	Split Point	135°	5-15	Medium	Activated Oils
Iron, Soft Case	Up to 150	Heavy Duty or Nitro®	Split Point	135°	75-150	Medium	Dry / Air
Iron, Medium Case	150-250	Heavy Duty or Nitro®	Split Point	135°	50-100	Medium	Dry / Air
Iron, Hard Case	Over 250	Carbide	Standard	118°	40-75	Light to Medium	Dry / Air
Plastic & Related Materials	-	Low Helix	Low Angle	90°	100-200	Medium to Heavy	Dry / Air
Steel, Low Carbon Alloy	125-275	General Purpose	Standard	118°	50-70	Medium	Water Soluble
Steel, Medium Carbon Alloy	275-325	Heavy Duty or Nitro®	Split Point	135°	40-55	Medium	Water Soluble
Steel, High Carbon Alloy	Over 325	Cobalt	Split Point	135°	30-50	Medium	Water Soluble
Steel, Low & Medium Carbon Alloy	Below 175	General Purpose	Standard	118°	45-95	Medium to Heavy	Water Soluble
Steel, High Carbon Alloy	175-225	General Purpose	Standard	118°	45-65	Medium	Water Soluble
Stainless Steel, Austenitic	Below 300	Heavy Duty or Nitro®	Split Point	135°	40-60	Medium to Heavy	Water Soluble
Stainless Steel, Precipitation	Over 300	Cobalt	Split Point	135°	20-40	Medium	Cutting Oil

Feeds – Feed rates for drilling are governed by the drill diameter, machinability of materials and depth of hole.
Speeds – The speed of a drill is determined by the rate which the outer periphery of the tool rotates in relation to material being cut. In general, the SFM at which a drill will operate is within a range based upon the workpiece material, its condition, hardness and depth of hole. It is usually advisable to start the drilling process at a slower SFM and then increase to the maximum.
RPM = (SFM x 3.82) divided by TD = Revolutions Per Minute
SFM = RPM x TD x .262 = Surface Feet Per Minute
TD – Tool diameter in inches

Cobalt Drill Bit

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Size Bit Decimal Overall Length Shank Type Item # Availability Price Quantity UOM

Set 1/16 - 1/2

Set w/ Metal Index

Straight

DRILSETC

In Stock

$211.23395/EA

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29PC COBALT DRILL BIT SET 1/16-1/2 BY 64THS

$211.23395/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$211.23395/EA
4	$204.88492/EA
8	$187.04638/EA
24	$159.28593/EA

Set 1/16 - 1/2

Set w/ Round Index

Straight

DRILSETCR

In Stock

$209.59799/EA

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DRILL SET 29 PC, COBALT, ROUND 1/16-1/2 BY 64THS

$209.59799/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$209.59799/EA
4	$203.29813/EA
8	$185.59775/EA
24	$158.05229/EA

1/16

0.0625

1 7/8

Straight

DRIL1/16C

In Stock

$2.51059/EA

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1/16 COBALT JOBBER DRILL BIT

$2.51059/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.51059/EA
12	$2.51059/EA
48	$1.95065/EA
192	$1.44624/EA

5/64

0.0781

Straight

DRIL5/64C

In Stock

$2.47278/EA

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5/64 COBALT JOBBER DRILL BIT

$2.47278/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.47278/EA
12	$2.47278/EA
48	$1.92127/EA
192	$1.42446/EA

3/32

0.0938

2 1/4

Straight

DRIL3/32C

In Stock

$3.24864/EA

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3/32 COBALT JOBBER DRILL BIT

$3.24864/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.24864/EA
12	$3.24864/EA
48	$2.52409/EA
192	$1.87141/EA

7/64

0.1094

2 5/8

Straight

DRIL7/64C

In Stock

$3.02302/EA

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7/64 COBALT JOBBER DRILL BIT

$3.02302/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.02302/EA
12	$3.02302/EA
48	$2.34879/EA
192	$1.74144/EA

1/8

0.1250

2 3/4

Straight

DRIL1/8C

In Stock

$3.60871/EA

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1/8 COBALT JOBBER DRILL BIT

$3.60871/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.60871/EA
12	$3.60871/EA
48	$2.80385/EA
192	$2.07883/EA

9/64

0.1406

2 7/8

Straight

DRIL9/64C

In Stock

$3.48832/EA

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9/64 COBALT JOBBER DRILL BIT

$3.48832/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$3.48832/EA
12	$3.48832/EA
48	$2.71032/EA
192	$2.00948/EA

5/32

0.1563

3 1/8

Straight

DRIL5/32C

In Stock

$4.11373/EA

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5/32 COBALT JOBBER DRILL BIT

$4.11373/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.11373/EA
12	$4.11373/EA
48	$3.19624/EA
192	$2.36975/EA

11/64

0.1719

3 1/4

Straight

DRIL11/64C

In Stock

$4.06576/EA

See Quantity Discounts

11/64 COBALT JOBBER DRILL BIT

$4.06576/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.06576/EA
12	$4.06576/EA
48	$3.15897/EA
192	$2.34212/EA

3/16

0.1875

3 1/2

Straight

DRIL3/16C

In Stock

$5.21255/EA

See Quantity Discounts

3/16 COBALT JOBBER DRILL BIT

$5.21255/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$5.21255/EA
12	$5.21255/EA
48	$4.04999/EA
192	$3.00274/EA

13/64

0.2031

3 5/8

Straight

DRIL13/64C

In Stock

$5.67112/EA

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13/64 COBALT JOBBER DRILL BIT

$5.67112/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$5.67112/EA

7/32

0.2188

3 3/4

Straight

DRIL7/32C

In Stock

$5.6871/EA

See Quantity Discounts

7/32 COBALT JOBBER DRILL BIT

$5.6871/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$5.6871/EA

15/64

0.2344

3 7/8

Straight

DRIL15/64C

In Stock

$6.68579/EA

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15/64 COBALT JOBBER DRILL BIT

$6.68579/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$6.68579/EA

1/4

0.2500

Straight

DRIL1/4C

In Stock

$7.11795/EA

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1/4 COBALT JOBBER DRILL BIT

$7.11795/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$7.11795/EA

17/64

0.2656

4 1/8

Straight

DRIL17/64C

In Stock

$8.72728/EA

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17/64 COBALT JOBBER DRILL BIT

$8.72728/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$8.72728/EA

9/32

0.2813

4 1/4

Straight

DRIL9/32C

In Stock

$9.90703/EA

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9/32 COBALT JOBBER DRILL BIT

$9.90703/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$9.90703/EA

19/64

0.2969

4 3/8

Straight

DRIL19/64C

In Stock

$10.27745/EA

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19/64 COBALT JOBBER DRILL BIT

$10.27745/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$10.27745/EA

5/16

0.3125

4 1/2

Straight

DRIL5/16C

In Stock

$11.6095/EA

See Quantity Discounts

5/16 COBALT JOBBER DRILL BIT

$11.6095/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$11.6095/EA
6	$11.6095/EA
24	$9.02021/EA
96	$6.68775/EA

21/64

0.3281

4 5/8

Straight

DRIL21/64C

In Stock

$12.35392/EA

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21/64 COBALT JOBBER DRILL BIT

$12.35392/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$12.35392/EA

11/32

0.3438

4 3/4

Straight

DRIL11/32C

In Stock

$11.81512/EA

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11/32 COBALT JOBBER DRILL BIT

$11.81512/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$11.81512/EA

23/64

0.3594

4 7/8

Straight

DRIL23/64C

In Stock

$15.68131/EA

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23/64 COBALT JOBBER DRILL BIT

$15.68131/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$15.68131/EA

3/8

0.3750

Straight

DRIL3/8C

In Stock

$15.13556/EA

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3/8 COBALT JOBBER DRILL BIT

$15.13556/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$15.13556/EA

25/64

0.3906

5 1/8

Straight

DRIL25/64C

In Stock

$15.11824/EA

See Quantity Discounts

25/64 COBALT JOBBER DRILL BIT

$15.11824/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$15.11824/EA

13/32

0.4063

5 1/4

Straight

DRIL13/32C

In Stock

$19.37742/EA

See Quantity Discounts

13/32 COBALT JOBBER DRILL BIT

$19.37742/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$19.37742/EA

27/64

0.4219

5 3/8

Straight

DRIL27/64C

In Stock

$20.43744/EA

See Quantity Discounts

27/64 COBALT JOBBER DRILL BIT

$20.43744/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$20.43744/EA

7/16

0.4375

5 1/2

Straight

DRIL7/16C

In Stock

$20.81306/EA

See Quantity Discounts

7/16 COBALT JOBBER DRILL BIT

$20.81306/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$20.81306/EA

29/64

0.4531

5 5/8

Straight

DRIL29/64C

In Stock

$19.71002/EA

See Quantity Discounts

29/64 COBALT JOBBER DRILL BIT

$19.71002/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$19.71002/EA

15/32

0.4688

5 3/4

Straight

DRIL15/32C

In Stock

$19.48198/EA

See Quantity Discounts

15/32 COBALT JOBBER DRILL BIT

$19.48198/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$19.48198/EA

31/64

0.4844

5 7/8

Straight

DRIL31/64C

In Stock

$24.22038/EA

See Quantity Discounts

31/64 COBALT JOBBER DRILL BIT

$24.22038/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$24.22038/EA

1/2

0.5000

Straight

DRIL1/2C

In Stock

$26.96968/EA

See Quantity Discounts

1/2 COBALT JOBBER DRILL BIT

$26.96968/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$26.96968/EA

0.2280

3 7/8

Straight

DRIL001C

In Stock

$7.98548/EA

See Quantity Discounts

#1 COBALT JOBBER DRILL BIT

$7.98548/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$7.98548/EA
12	$7.98548/EA
48	$6.20447/EA
192	$4.6001/EA

0.2010

3 5/8

Straight

DRIL007C

In Stock

$6.14035/EA

See Quantity Discounts

#7 COBALT JOBBER DRILL BIT

$6.14035/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$6.14035/EA
12	$6.14035/EA
48	$4.77086/EA
192	$3.5372/EA

#11

0.1910

3 1/2

Straight

DRIL011C

In Stock

$4.56279/EA

See Quantity Discounts

#11 COBALT JOBBER DRILL BIT

$4.56279/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.56279/EA
12	$4.56279/EA
48	$3.54515/EA
192	$2.62844/EA

#21

0.1590

3 1/4

Straight

DRIL021C

In Stock

$4.4389/EA

See Quantity Discounts

#21 COBALT JOBBER DRILL BIT

$4.4389/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.4389/EA
12	$4.4389/EA
48	$3.44888/EA
192	$2.55707/EA

#29

0.1360

2 7/8

Straight

DRIL029C

In Stock

$4.60045/EA

See Quantity Discounts

#29 COBALT JOBBER DRILL BIT

$4.60045/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.60045/EA
12	$4.60045/EA
48	$3.57441/EA
192	$2.65013/EA

#32

0.1160

2 3/4

Straight

DRIL032C

In Stock

$2.7677/EA

See Quantity Discounts

#32 COBALT JOBBER DRILL BIT

$2.7677/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.7677/EA
12	$2.7677/EA
48	$2.15041/EA
192	$1.59435/EA

#44

0.0860

2 1/8

Straight

DRIL044C

In Stock

$2.81307/EA

See Quantity Discounts

#44 COBALT JOBBER DRILL BIT

$2.81307/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$2.81307/EA
12	$2.81307/EA
48	$2.18566/EA
192	$1.62049/EA

#55

0.0520

1 7/8

Straight

DRIL055C

2-4 Working Days

$2.55596/EA

See Quantity Discounts

#55 COBALT JOBBER DRILL BIT

$2.55596/EA

Qty

2-4 Working Days

Product Detail

Quantity	Price
Quantity	Price
1	$2.55596/EA
12	$2.55596/EA
48	$1.9859/EA
192	$1.47238/EA

0.2570

4 1/8

Straight

DRILF-C

In Stock

$4.79372/EA

See Quantity Discounts

F COBALT JOBBER DRILL BIT

$4.79372/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$4.79372/EA

0.3680

Straight

DRILU-C

In Stock

$16.28378/EA

See Quantity Discounts

U COBALT JOBBER DRILL BIT

$16.28378/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$16.28378/EA

Cobalt Drill Bit

Cobalt Drill Bit

Technical Data

Fractional Sizes

Fractional SizesCobalt Drill Bit

Wire Sizes

Wire SizesCobalt Drill Bit

Letter Sizes

Letter SizesCobalt Drill Bit

Drill Feeds & Speeds

Drill Feeds & Speeds

Size

Overall Length

Style

29PC COBALT DRILL BIT SET 1/16-1/2 BY 64THS

DRILL SET 29 PC, COBALT, ROUND 1/16-1/2 BY 64THS

1/16 COBALT JOBBER DRILL BIT

5/64 COBALT JOBBER DRILL BIT

3/32 COBALT JOBBER DRILL BIT

7/64 COBALT JOBBER DRILL BIT

1/8 COBALT JOBBER DRILL BIT

9/64 COBALT JOBBER DRILL BIT

5/32 COBALT JOBBER DRILL BIT

11/64 COBALT JOBBER DRILL BIT

3/16 COBALT JOBBER DRILL BIT

13/64 COBALT JOBBER DRILL BIT

7/32 COBALT JOBBER DRILL BIT

15/64 COBALT JOBBER DRILL BIT

1/4 COBALT JOBBER DRILL BIT

17/64 COBALT JOBBER DRILL BIT

9/32 COBALT JOBBER DRILL BIT

19/64 COBALT JOBBER DRILL BIT

5/16 COBALT JOBBER DRILL BIT

21/64 COBALT JOBBER DRILL BIT

11/32 COBALT JOBBER DRILL BIT

23/64 COBALT JOBBER DRILL BIT

3/8 COBALT JOBBER DRILL BIT

25/64 COBALT JOBBER DRILL BIT

13/32 COBALT JOBBER DRILL BIT

27/64 COBALT JOBBER DRILL BIT

7/16 COBALT JOBBER DRILL BIT

29/64 COBALT JOBBER DRILL BIT

15/32 COBALT JOBBER DRILL BIT

31/64 COBALT JOBBER DRILL BIT

1/2 COBALT JOBBER DRILL BIT

#1 COBALT JOBBER DRILL BIT

#7 COBALT JOBBER DRILL BIT

#11 COBALT JOBBER DRILL BIT

#21 COBALT JOBBER DRILL BIT

#29 COBALT JOBBER DRILL BIT

#32 COBALT JOBBER DRILL BIT

#44 COBALT JOBBER DRILL BIT

#55 COBALT JOBBER DRILL BIT

F COBALT JOBBER DRILL BIT

U COBALT JOBBER DRILL BIT