This Phillips flat head zinc plated sheet metal screw is a #10 x 2 in. size, supplied as a box of 100. It is designed to attach metal to metal and can also be used to attach metal to wood, fiberglass and plastic. Sharp threads draw materials together and ensure a secure hold. The self-tapping type AB design makes it easy to tap into and tighten against the material. Zinc plating offers moderate protection against rust and corrosion. For installation, drill a hole in the material that matches the diameter of the screw.