Features 1、Gear Shaft Adapter: Easily convert small gear holes with 32P 48P Mod1 5mm diameter to 3.175mm, allowing for versatile and customized gear compatibility. 2、Motor Compatibility: Compatible with 3.175mm shaft diameter motors such as for 550, 540, and for 3650 series motors, enabling seamless integration of 5mm gears onto 3.175mm (1/8 inch) shaft motors. 3、Accuracy Conversion: Convert 1/8 small gear motors to 1/10 small gear motors with the 3.175mm gear shaft adapter, expanding compatibility for 1/10 RC scale cars, boats, and popular brands like for Redcat, for ARRMA, for AXIAL. 4、Steel Construction: Crafted from steel for enhanced durability and long lasting performance, ensuring reliable and stable performance even under demanding conditions. 5、Ideal Replacement: These tools of robustness and standard size, are ideal replacement the old and damaged parts for better use experience. Item Type: Motor Gear Shaft Steel Sleeve Material: Steel Size: Approx. 3.175mm / 1/8 inch to 5mm Application: for RC Model Car Boat Plane 3650 550 540 Motor Inner Diameter: 3.175 mm (1/8 in.) Outer diameter: Approx. 5mm / 0.2in Length: Approx. 12mm / 0.47in Package List 10 x Adapters 20 x Screws 2 x Wrenches