ITEM NAME:Chain Drive Sprocket 10T Metal Gear 04C 10Tooth Pitch 6.35mm Outer Dia 23.5mm FT Product Description Specification: Suitable for pitch 6.35MM 04C #25 chain Sprocket outside diameter: 23.5mm Stepped diameter: 12mm The total thickness: 15mm Bore: rough machining Package Including:.Suitable for pitch 6.35MM 04C #25 chain. Bore: rough machining.