Hammer Drive Pin Anchor Set, Anchor Diameter 1/4 in, Overall Length 1 1/4 in, Thread Size Not Applicable, Thread Length Not Applicable, Anchor Material Zamac Alloy, Pin Material Steel, Finish Zinc Plated, Head Type Round, Drill Bit Size 1/4 in, Minimum Installation Depth 3/4 in, Maximum Material Thickness 1/2 in, Ultimate Tension Strength (4,000 psi Concrete) 814 lb, Pin-Drive Anchor Type Metal Removable Nail Drive Anchor, System of Measurement Inch