Box End Wrench, Alloy Steel, Chrome, Head Size 1/4 in, 5/16 in, Overall Length 4 1/4 in, 25°/ OVERALL LENGTH: 4.125 INCHES NOMINAL WRENCHING SURFACE SIZE: 0.250 INCHES NOMINAL FIRST END WRENCHING SURFACE SIZE: 0.312 INCHES NOMINAL SECOND END WRENCHING SURFACE SHAPE: 12 POINT BOTH ENDS INTERNAL SPECIAL FEATURES: 25 DEG OFFSET HEADS MATERIAL: STEEL OVERALL SURFACE TREATMENT: CHROMIUM OVERALL STYLE DESIGNATOR: 144 STRAIGHT DOUBLE HEAD