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 Flat Head Diameter 0.484252 in Head Height 0.1875 in Drive Type Phillips 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 Maximum Material Thickness 1 3/4 in