HILLMAN No. 8 in. X 1/2 in. L Self-Tapping Hex Washer Head Self-Drilling Screws 100 pk

This self-drilling screw is used in wood, fiberglass, and metal, and it possess a drill point enabling it to drill its own hole in thin gauge steel. The sharp threads create their own mating thread when drilled into the material. No pre-drilled pilot holes are necessary.