Concrete Anchor Screw, Anchor Diameter 1/4 in, Overall Length 4 in, Head Type Hex, Drive Type External Hex, Material Steel, Material Grade/Class Not Graded, Removable Removable, Compatible Material Block, Brick, Concrete, Drill Bit Size 11/64 in, Screw Anchor Type Concrete Screw Anchor, System of Measurement Inch, Maximum Ultimate Tension Strength 1,000 lb, Minimum Installation Depth 3/4 in, Ultimate Tension Strength (4,000 psi Concrete) 1,650 lb, Tip Type Pointed