Original Name / Part No.: 1548Part location: Pinion areaProduct major functions & usage: Connect with the motor and carry the motor to runAccessories:Motor Gear 1pc4x4 Set Screw 1pcMajor advantages of upgrading to this part/product :Made by harden steel #45, stronger and durable to achieve more smooth performance.Other special notes and comments:This product is 28T (original gear is 127T). Users shoud adjust to the corresponding positioning hole of the motor mount during installation.