Hammer Drive Pin Anchor Anchor Diameter 1/4 in Overall Length 2 1/2 in Anchor Material Steel Finish Zinc Plated Head Type Flat Head Height 0.140625 in Head Diameter 0.5 in Drill Bit Size 1/4 in Minimum Installation Depth 1 in Drive Pin Anchor Type Vibration-Resistant Drive Anchors Compatible Material Block Concrete Stone Material Grade/Class 1038 Removable Permanent System of Measurement Inch Manufacturer Location Globally Sourced Material Quality Standards ASTM E488