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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 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: 116g Hardness: 40-45 HRC Overall Size: 193 x 30 x 5mm / 7.6-inch x 1.18-inch x 0.2-inch (L*W*T) Fit For Round Nut: 45-52mm / 1.77-inch-2-inch