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1.Made of drop forged 45# steel for strength and durability.2.Hardness: 40-45 HRC.3.A wrench with one hook, for round ER chuck nut.4.Coated handle grip offers the ultimate comfortable nonslip control.5.Designed to drive spanner head screws, threaded and retainer rings, shafts, and so on. Specification:Product Name: Hook WrenchPackage Content: 1 x Hook WrenchMaterial: Drop Forged 45# Steel, PlasticFinish: ElectrophoresisWeight: 303gHardness: HRC 40-45Overall Size: 260 x 50mm / 10.24-inch x 1.97-inch (L*W)Fit For Chuck Nut: C32 68-73mm