Box End Wrench, Alloy Steel, Chrome, Head Size 5/8 in, 11/16 in, Overall Length 8 in, 0°/ OVERALL LENGTH: 8.109 INCHES NOMINAL WRENCHING SURFACE SIZE: 0.625 INCHES NOMINAL FIRST END WRENCHING SURFACE SIZE: 0.688 INCHES NOMINAL SECOND END WRENCHING SURFACE SHAPE: 12 POINT BOTH ENDS INTERNAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: CHROMIUM OVERALL STYLE DESIGNATOR: 144 STRAIGHT DOUBLE HEAD