Description: 100% Brand New and high quality 420 Chain,29 Tooth Rear Sprocket. Made of durable metal for a long time to use. CNC manufactured,heat treated. Anodized to prevent corrosion. Easy to install. Fitment: for HONDA Z50A Z50 Z50R Z50J Monkey Bike Motor. Specification: Material: Metal Total Diameter: Approx. 122 mm / 4.8 inch Internal Diameter : Approx. 30 mm / 1.18 inch Bolt Hole Diameter: Approx. 8.5 mm / 0.33 inch Bolt Hole Distance: Approx. 46 mm / 1.81 inch (3 bolts hold to rear hub) Thickness: 6 mm / 0.24 inch Package Includes: 1 Piece 29 Tooth Rear Sprocket Note: 1.Please confirm this item is what you want before payment. 2.Please allow slightly difference due to manual measurement. Thanks for understanding!