Hammer Drive Anchor Anchor Diameter 1/4 in Overall Length 2 3/4 in Anchor Material Steel Finish Zinc Plated Head Type Flat Head Height Not Applicable Head Diameter Not Applicable Drill Bit Size 1/4 in Minimum Installation Depth 1 1/8 in Ultimate Shear Strength (4 000 psi Concrete) Not Applicable Ultimate Tension Strength (4 000 psi Concrete) 936 lb Drive Pin Anchor Type Steel Drive Anchors Compatible Material Masonry Stone Material Grade/Class Not Applicable