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1: 2 Spiral Bevel Gear Under an identical modulus, the variety of 1:2 tooth is 90 degrees;Material: 45 # steelShaft hole: machining completedTreatment: total blackeningSpeed ratio: matching 1:2 Installation distance:1M15T 25mm1M30T 20mm1M20T 29.6mm1M40T 21.8mm