This Robinson Racing Products pinion gear features 17 teeth in 32 pitch (0.8 module) sizing with a 5mm bore, designed to fit a motor shaft securely with the included set screw. It is machined from blackened steel and given an extra-hard treatment for increased wear resistance compared to standard pinions. The 32p pitch makes it compatible with a wide range of popular electric RC platforms running matching spur gears. Features: 17 tooth count, 32 pitch / 0.8 module 5mm bore fits standard motor shafts Extra-hard blackened steel construction Includes set screw for shaft retention 7/7/26 cs