Welcome to our store! The worm gear is made from high-grade 94 copper, offering high strength, corrosion resistance, excellent wear resistance, and strong impact resistance. 40Cr Carbonitrided and Hardened. Made from carbonitrided alloy structural steel, it features high strength, high hardenability, high wear resistance, smooth power transmission, and low noise. The motor’s power output flows smoothly. A three-layer high-density molecular coating effectively blocks dust and withstands high temperatures. The dual ball bearings are axially mounted, offering high load capacity, low friction, and excellent oil retention. The carbon brushes are forged from carbon/alloy and undergo full-body high-temperature quenching, resulting in high hardness, ease of use, and durability. Motor shaft diameter: 15 mm (key pin 5 × 5 × 25)/18 mm (key pin 6 x 6 x 30). Can the speed be adjusted: Yes. Forward and reverse: Yes. 1 x Set of motor. This package does not include a DC power supply. Overloading the motor is strictly prohibited! Please check with y. We are not responsible. OR, you may choose to have a replacement. Our aim is to provide Top Level Customer Service, normally so we will try our best to solve any problem you have. Please DON’T leave negative or neutral feed.