Hammer Drive Anchor, Anchor Diameter 1/4 in, Overall Length 3 1/2 in, Anchor Material Steel, Finish Zinc Plated, Head Type Flat, Head Height Not Applicable, Head Diameter 0.5 in, Drill Bit Size 1/4 in, Minimum Installation Depth 1 1/8 in, Ultimate Shear Strength (4,000 psi Concrete) 2,230 lb, Ultimate Tension Strength (4,000 psi Concrete) 2,010 lb, Drive Pin Anchor Type Steel Drive Anchors, Compatible Material Masonry, Stone, Material Grade/Class Grade 5, Removable Removable