DocumentSize: Inner Diameter: 3.17mm (1/8"); Outer Diameter: 5mm; Total Length:12mm.5mm to 3.175mm pinion reducer sleeve adapter, for converting RC motor pinion gearsMakes 5mm pinion gear work on a 3.175mm (1/8 inch) shaft gear motor.Made from durable steel to withstand high torque and ensure long-lasting performance.Good pinion gear replacement parts for your device.

3pcs Pinion Gear Adapter 5mm to 3.175mm 1/8" Drive Shaft Coupler Sleeve Adapter
- Size: Inner Diameter: 3.17mm (1/8"); Outer Diameter: 5mm; Total Length:12mm.
- 5mm to 3.175mm pinion reducer sleeve adapter, for converting RC motor pinion gears
- Makes 5mm pinion gear work on a 3.175mm (1/8 inch) shaft gear motor.
- Made from durable steel to withstand high torque and ensure long-lasting performance.
- Good pinion gear replacement parts for your device.