This is the Extra Hard 5mm .8 Module 14 Tooth Brushless Motor Pinion Gear from Robinson Racing. FEATURES: Extra Hard Construction, gun in color Fits motors with 5mm shaft diameter Will also work on stock motors using a reducer sleeve (RRPC1200) INCLUDES: One 5mm .8 Module 14T Pinion Gear One 4x4mm set screw (RRPC1201) REQUIRES: Installation onto the motor shaft SPECS: Length: 0.47" (12mm) Mounting hole diameter: 5mm COMMENTS: Also available is a: 12 tooth pinion (RRPC8712) 20 tooth pinion (RRPC8720) 13 tooth pinion (RRPC8713) 21 tooth pinion (RRPC8721) 15 tooth pinion (RRPC8715) 22 tooth pinion (RRPC8722) 16 tooth pinion (RRPC8716) 23 tooth pinion (RRPC8723) 17 tooth pinion (RRPC8717) 24 tooth pinion (RRPC8724) 18 tooth pinion (RRPC8718) 25 tooth pinion (RRPC8725) 19 tooth pinion (RRPC8719) cnh 6/21/08 ir/jxs