Concrete Anchor Screw, Anchor Diameter 1/4 in, Screw Size 1/4 in, Overall Length 2 3/4 in, Thread Length 2 1/4 in, Head Type Hex, Head Width 0.3125 in, Head Diameter 0.4134 in, Head Height 0.1875 in, Drive Type External Hex, Material Steel, Finish Blue Ruspert, Material Grade/Class Grade C, Removable Removable, Compatible Material Masonry, Stone, Wood, Drill Bit Size 3/16 in, Screw Anchor Type Concrete Screw Anchor, System of Measurement Inch, Includes Drill Bit