Product Description:Name: Chain Drive SprocketModel: #25 04CTooth pitch: 1/4; (6.35mm)Material: #45 steelSprocket Surface treatment: black oxide / high-frequency quenchingTooth:36-60TeethHole: 10/12mmNote: Due to various batches of products, the final dimensions will be changed, please confer with the genuine object!Remarks: If you've special needs, please contact us, we will customise per your needs!Package Include:According on your Choose * 1