● Number of Teeth： 12T，13T，14T，15T，16T，17T，18T，19T，20T，22T，24T，25T，28T，30T，32T ，34T，35T ，36T，38T，40T ，48T ，50T. It is made of high-quality C45 steel. The tooth surface is high-frequency hardened, hardened finish, and the tooth surface is smooth, with strong tensile strength, durability and high efficiency.
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