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. | HILLMAN Project Center 50 Piece Zinc Pan Head Phillips Self Drilling Screws | Size 8-32 x 1-1/2"