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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.Designed to drive spanner head screws, threaded collars and retainer rings, shafts, and so on. 5.Built in a hanging hole. Specification: Product Name: Hook Wrench Package Content: 1 x Hook Wrench Material: Drop Forged 45# Steel Finish: Electrophoresis Weight: 76g Hardness: 40-45 HRC Overall Size: 158 x 27 x 4mm / 6.22-inch x 1.06-inch x 0.16-inch (L*W*T) Fit For Round Nut: 34-36mm / 1.34-inch-1.42-inch