Product Description:Product Name: Chain Drive SprocketModel: #25 04CTooth pitch: 1/4; (6.35mm)Material: #45 steelSprocket Surface treatment: black oxide / high-frequency quenchingTooth:9T,10T,11T,12T,13T,14T,15T,16T,17T,18T,19T,20T,21T,22T,23T,24TNote: Due to diversified batches of products, the overall dimensions can be changed, please discuss with the real object!Remarks: If you've got particular needs, please touch us, we are able to customize in line with your needs!Package Include: According to your Choose