Minerallac® Cully™ Self-Drilling Tek Screw, Measurement System: Imperial, 1/4-14 Thread, 1 in Overall Length, Hex Washer Head, Steel, Zinc Plated, Drill Point, #3 Point, 3/8 in Drive, 0.181 in H x 0.371 in W Head, Type BSD/Spaced External Thread, Silver