Hillman 560312 Screw, #8 Thread, 1/2 in L, Coarse Thread, Washer Head, Hex Drive, Self-Drilling Point, Zinc, 100 PK
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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.