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 AdapterMaterial: Stainless SteelColor: SilverApplication: for RC Motor 3650, 550, 540 PinionGross Weight: Approx.9g/0.3ozInner Diameter: 3.175mm/0.1inOuter Diameter: 5mm/0.2inLength: 12mm/0.5in.Package List:5 x Sleeve5 x Fixing Scerw1 x WrenchNote: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.