Minerallac® Cully™ Self-Drilling Tek Screw, Measurement System: Imperial, #12-14 Thread, 1 in Overall Length, Hex Washer Head, Steel, Zinc Plated, Drill Point, #3 Point, 5/16 in Drive, 0.303 in H x 0.309 in W Head, Type BSD/Spaced External Thread, Silver