Description: Product Type: This is 36-tooth electric bicycle gears, fit for your electric vehicle needs Material: Made from quality steel, these gears are sturdy and practical, fine workmanship and high precision, ensuring longlasting use Dimensions: 36 teeth, a diameter of 38mm, an inner diameter of 8mm, a thickness of 12mm and a bearing size of 608 Package includes: The package includes 3 types,3pcs Gear or 3pcs Gear with Clutch ,or Planetary Gear Full set Applications: It is an tool for all kinds of DIY cars, robots, and model making accessories Specification: Material: Steel or Copper Size Chart: Diameter: 3.8cm/1.50inch Gear Inner diameter: 0.8cm/0.31inch Thickness: 1.2cm/0.47inch Bearing: 608 Clutch diameter: 7cm/2.76inch Outer ring diameter:10.4cm/4.09inch Package Includes: Type 1: 3pcs Steel Gear or Type 2: 3pcs Copper Gear or Type 3: 3pcs Steel Gear with Clutch or Type 4: 3pcs Copper Gear with Clutch or Type 5: Steel Planetary Gear Full set or Type 6: Copper Planetary Gear Full set Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on line shopping!