Adjustable Face Spanner Wrench, Face, Alloy Steel, Black Oxide, Pin Diameter 5/16 in/ OVERALL LENGTH: 10.375 INCHES NOMINAL PIN DIAMETER: 0.312 INCHES NOMINAL CENTER TO CENTER DISTANCE BETWEEN PINS: 4.000 INCHES MAXIMUM MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL STYLE DESIGNATOR: 709 ADJUSTABLE FACE PIN SPECIFICATION/STANDARD DATA: 0U583-SAE AS6018 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD NONDEFINITIVE SPEC/STD DATA: 3 TYPE AND 2 CLASS