Adjustable Hook Spanner Wrench, Side, Alloy Steel, Black Oxide, Hook Thickness 15/32 in/ OVERALL LENGTH: 12.125 INCHES NOMINAL HOOK THICKNESS: 0.469 INCHES NOMINAL CIRCLE RANGE DIAMETER: 4.500 INCHES MINIMUM AND 6.250 INCHES MAXIMUM MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL STYLE DESIGNATOR: 566 ADJUSTABLE HOOK