This Robinson Racing Products pinion gear is a hard-machined 48 pitch, 45-tooth design with a 5mm bore, built to fit a wide range of 1:10 scale electric vehicles. The hardened metal construction is intended to outlast standard pinions under demanding conditions. A set screw is included for securing the gear to the motor shaft. Features: 48 pitch, 45 tooth 5mm bore Hardened metal construction Includes set screw 7/7/26 cs