Feature: 1. Stainless Steel Material: Made of high quality stainless steel material, durable, more powerful in use, higher and more stable transmission effect, providing a satisfying using experience. 2. Main Function: Install the motor shaft conversion sleeve on the 3.175mm motor shaft and then convert it into a 5mm diameter hole. 3. High Performance: Due to rugged material, fine workmanship, and high accuracy, the adapter can maximize the power of the remote control vehicles. 4. High Power: Easy for installation and disassembly, can achieve more efficient power transmission system, able to obtain higher power strength. 5. Rich Content: There are 5 sleeves, 1 L socket wrench and 5 M4 set screws included in the package, the rich content can meet your needs to convert your RC car or repair the damaged part. Specification: Item Type: RC Shaft Adapter Material: Stainless Steel Color: Silver Application: for RC Motor 3650, 550, 540 Pinion Gross Weight: Approx.9g/0.3oz Inner Diameter: 3.175mm/0.1in Outer Diameter: 5mm/0.2in Length: 12mm/0.5in. Package List: 5 x Sleeve5 x Fixing Scerw1 x Wrench Note: 1. Please allow 1‑3mm 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.