The Hillman Group 561028 10-16-Inch x 1-Inch Washer Head Neoprene Washer Self Product Description 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. 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. Features Self-Drilling Point Eases Installation Also Known As Sheet Metal Screws Neoprene Washer From The Brand Name: The Hillman Group USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.