Service Wrench, Alloy Steel, Satin, Head Size 50 mm, Overall Length 8 1/2 in, 30°/ OVERALL LENGTH: 8.500 INCHES NOMINAL HEAD THICKNESS: 0.312 INCHES NOMINAL WRENCHING SURFACE SIZE: 50.0 MILLIMETERS NOMINAL SINGLE END HEAD ANGLE: 30.0 DEGREES NOMINAL WRENCHING SURFACE SHAPE: OVAL SINGLE END INTERNAL SPECIAL FEATURES: SATIN FINISH MATERIAL: STEEL OVERALL SURFACE TREATMENT: CHROMIUM OVERALL STYLE DESIGNATOR: 81 SINGLE HEAD