Adjustable Hook Spanner Wrench, Side, Alloy Steel, Black Oxide, Hook Thickness 11/32 in/ OVERALL LENGTH: 6.375 INCHES NOMINAL HOOK THICKNESS: 0.344 INCHES NOMINAL CIRCLE RANGE DIAMETER: 0.750 INCHES MINIMUM AND 2.000 INCHES MAXIMUM 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