Feature: 1. ✔【QUALITY MATERIAL】-- Sprocket is made of high‑quality steel, strong and durable, has a long service life. 2. ✔【HIGH PERFORMANCE】-- With stable performance and high reliability, suitable for karts, ATVs, motorcycles. 3. ✔【SIZE】-- The diameter is 145mm and the inner diameter is 29mm, with great workmanship, perfect replacement for the old one. 4. ✔【SMALL AND PORTABLE】-- Convenient to use and with small size, easy to carry and store, very practically.Strict quality control and quality assurance, high safety factor, can be used with peace of mind. Specification: Item Type: Rear Chain Sprocket Material: Steel Diameter: Approx. 145mm / 5.7in Inner Diameter: Approx. 29mm / 1.1in Package List: 1 x Rear Chain Sprocket