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.
Used with permission, copyright 2019 Robinson Racing Products/Horizon Hobby, Inc,. Copyright 2019 Brey Corp. t/a Hobby Works