Open End Wrench, Alloy Steel, Black Oxide, Head Size 1 3/8 in, 1 7/16 in/ OVERALL LENGTH: 15.875 INCHES NOMINAL LARGE END HEAD THICKNESS: 0.531 INCHES NOMINAL SMALL END HEAD THICKNESS: 0.531 INCHES NOMINAL WRENCHING SURFACE SIZE: 1.375 INCHES NOMINAL FIRST END WRENCHING SURFACE SIZE: 1.438 INCHES NOMINAL SECOND END WRENCHING SURFACE SHAPE: OVAL BOTH ENDS INTERNAL SMALL END HEAD ANGLE: 15.0 DEGREES NOMINAL LARGE END HEAD ANGLE: 15.0 DEGREES NOMINAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL STYLE DESIGNATOR: 104 DOUBLE HEAD