Small size, low heat generation, multiple protections; high efficiency, multiple speed regulation, large torque. Motor: within the rated speed, if there is no overload, the torque is basically unchanged. The motor can be adjusted forward and reverse for a long time without being affected. Small size, does not take up space. Motor length L (mm):105. Center hole distance: 65. Mounting hole: 6mm through hole. 1x 450W High voltage 80 brushless motor + 1x reducer + 1x controller. If you want other speed and gearbox ratio, pls kindly free contact to us. There are NO EXCEPTIONS! OR, you may choose to have a replacement. We will reply you ASAP. Our aim is to provide Top Level Customer Service, normally so we will try our best to solve any problem you have. Our customer-oriented service strives for. Business time: GMT8 (9:00-18:00) from Monday to Friday.