Product Description Features Head Type: Hex Head Drive Type: Hex Drive Product Type: Screws With Washers Material Type: Steel Callout Size: 1 Length: 2-1/2 in. Container Size: 75 per box Self Drilling: Yes Color: Silver Point Type: Sharp Thread Type: Coarse Self Tapping: No Indoor and Outdoor: Indoor Application: Used in Wood, Fiberglass and Metal and They Possess a Drill Point Enabling it to Drill in its own Hole in Thin Gauge Steel Finish: Zinc . From the Manufacturer 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.