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Specification:Name: Chain Drive SprocketModel: #25 04CMaterial: 45# SteelSurface Treatment: Hardening of enamel surfacesTeeth Pitch: 1/4'' (6.35mm)Teeth: 24 Teeth ~ 39 TeethNote:1.The center is the method hole, desire prospects to buy back their own processing to expand.2.The size of the process holes may well fluctuate from batch to batch. If you've requirements for the scale of the method hole, please seek the advice of customer support for the actual size.3.Due to the batch of alternative step diameter may even vary, please be triumphant in kind.Package :Packing : Plastic bag / Carton box.Quantity : According for your Choose!