Drive Anchor Anchor Diameter 1/4 in Overall Length 2 1/4 in Thread Size Not Applicable Thread Length Not Applicable Anchor Material Zamac Alloy Pin Material Steel Finish Zinc Plated Head Type Round Head Diameter 0.54 in Head Height 0.140625 in Nut Width Not Applicable Washer Outside Diameter Not Applicable Drill Bit Size 1/4 in Minimum Installation Depth 1 1/8 in Maximum Material Thickness Not Applicable Pin-Drive Anchor Type Metal Removable Screw-Drive Anchor