The Hillman Group 560673 1/4-Inch x 2-3/4 Flat Head Phillips Self Drilling Screws with Wings, 100-Pack, No Size, zinc
These self-drilling screws are used in wood, fiberglass and metal, and they possess a drill point enabling it to drill in 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 necessary.