2 in Hardened Steel Self Drilling Screw with Hex Washer Head Type and Zinc-Plated Finish/ FASTENER LENGTH: 2.000 INCHES NOMINAL HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.139 INCHES NOMINAL WIDTH BETWEEN FLATS: 0.305 INCHES NOMINAL PART NAME ASSIGNED BY CONTROLLING AGENCY: SELF DRILLING SHEET METAL SCREW, NUMBER 12 X 2 INCH