HILLMAN No. 4 Ga. X 2-3/4 in. L Phillips Flat Head Sheet Metal 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.