Combination Wrench, Alloy Steel, Satin, 1 3/8 in Head Size, 18 1/2 in Overall Length/ OVERALL LENGTH: 18.500 INCHES NOMINAL WRENCHING SURFACE SIZE: 1.375 INCHES NOMINAL BOTH ENDS HEAD ANGLE: 15.0 DEGREES NOMINAL WRENCHING SURFACE SHAPE: OVAL FIRST END INTERNAL WRENCHING SURFACE SHAPE: 12 POINT SECOND END INTERNAL WRENCHING END OFFSET ANGLE: 15.0 DEGREES NOMINAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: CHROMIUM OVERALL STYLE DESIGNATOR: 63 OFFSET SPECIFICATION/STANDARD DATA: 81343-SAE AS954 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD NONDEFINITIVE SPEC/STD DATA: 2 TYPE AND 4 CLASS AND A STYLE