Description: Suitable:motor gear is Suitable for 1/5 RC Car. Material:It is made of high quality medium carbon steel, which is more solid, wear resistant, and has better transmission performance. Feature:Solid hardened steel gear not need aluminum alloy straight shaft and are not easy to be damaged. FINE PROCESSING: detail processing, DIY modified accessories. PERFECT GIFT: This remote control car parts is the perfect birthday gift for children and cars lovers. Size Chart: 20T diameter: 3.4cm/1.34inch hole:8mm/0.31inch 25T diameter:4cm/1.57inchhole:8mm/0.31inch 30T diameter:4.9cm/1.93inchhole:6mm/0.24inch 35T diameter:5.6cm/2.20inchhole:6mm/0.24inch Package Includes: 1 steel gear set Note: Please allow slightly errors due to manual measurement and different monitors.