Product Specification:Name: Sprocket Wheel Chain GearType: 3/8 Inch 06BMaterial: Carbon SteelSurface Treatment: High Frequency Hardening of TeethTeeth Number: 10-16 TeethRound Bore: 10/12/14/15/16/17/18/19/20/22mmKeyway Bore:10mm(keyway 4mm)12mm (keyway 4mm)14mm (keyway 5mm)15mm (keyway 5mm)16mm (keyway 5mm)17mm (keyway 5mm)18mm (keyway 6mm)19mm(keyway 6mm)20mm (keyway 6mm)22mm (keyway 6mm)Application:For use with curler chainsNote:Due to diverse manufacturing batches, the size (such as steps, whole height, top wire, etc.) may well vary slightly, please talk to the particular product.Package :Packing : Plastic bag / Carton box.Quantity : According for your Choose!