Stainless #10 x 1" Hex Washer Head Self Drilling Sheet Metal Tek Screws With Drill Point, (1/2" To 2" Lengths in Listing) 100 pieces (#10 x 1 inch) Driver Size: 5/16" Hex Tensile - 180,000 psi, Hardness - 40 Rockwell C Type BSD is a tapping screw with spaced threads and a drill point which drills its own hole #3 Drill Point