Hammer Drive Pin Anchor, Anchor Diameter 1/4 in, Overall Length 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