Hammer Drive Pin Anchor, Anchor Diameter 1/4 in, Overall Length 1 in, Thread Size Not Applicable, Thread Length Not Applicable, Anchor Material Nylon, Pin Material Steel, Finish Plain, Head Type Flat, Drill Bit Size 1/4 in, Minimum Installation Depth 3/4 in, Maximum Material Thickness 1/4 in, Ultimate Tension Strength (4,000 psi Concrete) 55 lb, Pin-Drive Anchor Type Nylon Removable Nail Drive Anchor, System of Measurement Inch, Compatible Material Block, Brick, Concrete, Masonry