Extra Hard Steel 5mm Bore (1.0 module) Brushless Motor Pinions. One 4x4mm set screw included. 2mm allen wrench (not included) fits the 4mm set screw. Can be run on cars using a 5mm motor shaft. These pinions mate with most 1/8 scale nitro spur gears.
5mm to 1/8 inch Reducer Sleeve required for 1/8 inch shaft motors.