Specification:Name: Sprockets Chain GearType: 04CMaterial: 304 Stainless SteelSurface Treatment: UntreatedPitch: 6.35mmTeeth Number: 13 TeethRound Bore: 8/10/12mmKeyway Bore:8mm (keyway 3x1.4)10mm (keyway 3x1.4)10mm (keyway 4x1.8)Application:For use with roller chainsNote:Due to diversified manufacturing batches, the dimensions (such as steps, total height, peak wire, etc.) might differ slightly, please talk over with the particular product.Package :Packing : Plastic bag / Carton box.Quantity : According on your Choose!