Product Description: Product Name: Chain Drive Sprocket Model: 08B Tooth pitch: 12.7mm Material: A3 metal Sprocket Surface treatment: high-frequency quenching Tooth:25 Tooth-40 Tooth Note: Due to diverse batches of products, the overall dimensions will be changed, please talk to the genuine object! Remarks: If you have special needs, please touch us, we will customise per your needs!Package Include: According for your Choose * 1