Product Description:Product Name: Chain Drive SprocketModel: 06BTooth pitch: 9.525mmMaterial: 45# steelFixing method: NO screw holeTooth surface treatment: enamel surface quenchingTooth:25T-40TProcess hole:14mm(Different batches can result in several inner holes)Note: Due to diversified batches of products, the overall dimensions will be changed, please talk to the real object!Remarks: If you have particular needs, please touch us, we will customise in step with your needs!Package Include:According to your Choose!