Pre-Expanded Anchor Anchor Diameter 1/4 in Overall Length 2 3/4 in Anchor Material Steel Finish Zinc Plated Head Type Flat Head Height 0.5625 in Head Diameter 0.5 in Drill Bit Size 1/4 in Minimum Installation Depth 1 1/8 in Drive Pin Anchor Type Vibration-Resistant Drive Anchors Compatible Material Block Concrete Stone Material Grade/Class 1038 Removable Removable System of Measurement Inch Manufacturer Location Globally Sourced Material Quality Standards ASTM E488