Self-drilling screws, commonly known as Tek screws, eliminate the need for pre-drilling and are widely used in metal-to-metal and metal-to-wood fastening applications. STS Industrial stocks self-drilling screws in hex head, flat head, and pan head styles with options for rubber or neoprene washers for weathertight installations. Available in zinc-plated, stainless steel, and other corrosion-resistant finishes.