Adjustable Hook Spanner Wrench, Side, Alloy Steel, Black Oxide, Hook Thickness 15/32 in/ OVERALL LENGTH: 11.250 INCHES NOMINAL HOOK THICKNESS: 0.469 INCHES NOMINAL CIRCLE RANGE DIAMETER: 2.000 INCHES MINIMUM AND 4.750 INCHES MAXIMUM MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL STYLE DESIGNATOR: 566 ADJUSTABLE HOOK NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 1 CLASS