Pre-Expanded Anchor Anchor Diameter 1/4 in Overall Length 1 5/8 in Anchor Material Steel Finish Zinc Plated Head Height 0.640625 in Head Diameter Not Applicable 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 Permanent System of Measurement Inch Manufacturer Location Globally Sourced Material Quality Standards ASTM E488