This is the 12T Long Shank Pinion Gear from Tekno. Constructed of hardened steel Mod 1, 5mm bore For use with Tekno's V3 Brushless Conversion Kits for use with the Losi 8, 8T, and Associated RC8 Two M4 setscrew holes (for long shafts) to secure the pinion to the motor shaft Allows the use of ESC/motor brakes on your Tekno converted vehicle One 12T Long Shank Pinion Gear Two 4x4mm Set Screws Installation on the motor Length: 23.4mm (0.92") Inner Diameter: 5mm (0.20") cnh 2/23/10 ir/jxs &