Concrete Anchor Screw Anchor Diameter 1/4 in Screw Size 1/4 in Overall Length 1 3/4 in Thread Size Not Applicable Thread Length 15/16 in Head Type Flat Head Width Not Applicable Head Diameter 0.3125 in Head Height Not Applicable Drive Type Phillips Material Plastic Finish Plain Material Grade/Class Not Applicable Removable Permanent Compatible Material Concrete Drill Bit Size 1/4 in Screw Anchor Type Conical Plug Anchor System of Measurement Inch