Features 1、Suitable for: car, remote control car and motorcycles, ATV, karting, child vehicles and other modifications. 2、Kids electric car rear motor gear box special use part spare part replacement. 3、Drive motor gearbox for rear-wheel drive( for six plum ). 4、This gearbox middle gear is metal, and with heat dissipation vane. 5、This gearbox features high speed, low noise, and wear-resisting. Specification Features: Suitable for: car, remote control car and motorcycles, ATV, karting, child vehicles and other modifications. Kids electric car rear motor gear box special use part spare part replacement. Drive motor gearbox for rear-wheel drive( for six plum ). This gearbox middle gear is metal, and with heat dissipation vane. This gearbox features high speed, low noise, and wear-resisting. Specification: Motor: RS550 Length: 5.7cm/2.2in Diameter: 3.5cm/1.4in Voltage: 12V Type:550~30000RPM/550-23000RPM/550-18000RPM/550-15000RPM/550-12000RPM/550-10000RPM/550-8000RPM/550-20000RPM(Optional) Package Included: 1 x Gearbox Package List