Minerallac® Cully™ Self-Drilling Tek Screw, Measurement System: Imperial, #8-18 Thread, 1/2 in Overall Length, Hex Washer Head, Steel, Zinc Plated, Drill Point, #2 Point, 1/4 in Drive, 0.103 in H x 0.247 in W Head, Type BSD/Spaced External Thread, Silver