Adjustable Hook Spanner Wrench, Side, Alloy Steel, Black Oxide, Hook Thickness 1/2 in/ OVERALL LENGTH: 8.125 INCHES NOMINAL HOOK THICKNESS: 0.406 INCHES NOMINAL CIRCLE RANGE DIAMETER: 1.250 INCHES MINIMUM AND 3.000 INCHES MAXIMUM ENVIRONMENTAL ATTRIBUTE CODE: MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL STYLE DESIGNATOR: 566 ADJUSTABLE HOOK SPECIFICATION/STANDARD DATA: 0U583-SAE AS6018 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 1 CLASS