Feature: 1. Hard Steel Material: Made of high quality metal steel material with high strength and wear resistance, having good performance for long service life. 2. Fine Workmanship: Pinion gear outer layer has received hard anodic oxidation and rust proof treatment, able to ensure a satisfying using and long service life. 3. Easy to Use: Come with fixing screw hole, easy for installation and operation, the package will come with M4 set screws, making your installation and repair more effortless. 4. High Performance: Small size and light weight, these features can give full play to the best performance, improving the RC vehicle power and overall performance. 5. High Force Loading: Has the ability to withstand high force, making your remote control car have a satisfying property. Suitable for 5mm/0.2in shaft diameter motor. Specification: Item Type: RC Motor Gear Material: Steel Color: Black Teeth: 15T, 17T, 20T Application: for ARRMA Granite, for Big Rock, for Typhoon, for Senton 3S Brushless and Brushed Series 1/10 Remote Control Vehicle Applicable Motor: 5mm/0.2in Shaft Diameter Motor Hole Diameter: 5mm/0.2in Product Size: 15T: Diameter: Approx.13mm/0.51in Height: Approx.13mm/0.51in 17T: Diameter: Approx.15mm/0.6in Height: Approx.14mm/0.55in 20T: Diameter: Approx.17mm/0.7in Height: Approx.14mm/0.55in Gross Weight: Approx.31g/1.1oz Module: 0.8MOD Radial Spacing: 32P. Package List: 3 x Motor Gear3 x Set Screws1 x Wrench Note: 1. Please allow 1‑3cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.