Features: 1.Widely used in 3D printers for transmission in hardware, mold and machinery. 2.High quality: Made of aluminum alloy material, light weight, anti-oxidation, corrosion resistance, fine CNC cutting, beautiful appearance, high precision and long service life. 3.Function: Used for connecting the drive shaft and the model motor can stably transmit the driving force in precise coaxiality. 4.Uses: Shafts commonly used for transmission motion, widely used in DIY models, such as RC models, cars or boats, etc., as connectors for connecting different components. 5.Durable to use. specification: 1. Widely used in 3D printers for transmission in hardware, mold and machinery. 2. High quality: Made of aluminum alloy material, light weight, anti-oxidation, corrosion resistance, fine CNC cutting, beautiful appearance, high precision and long service life. 3. Function: Used for connecting the drive shaft and the model motor can stably transmit the driving force in precise coaxiality. 4. Uses: Shafts commonly used for transmission motion, widely used in DIY models, such as RC models, cars or boats, etc., as connectors for connecting different components. 5. Durable to use. : Material: Aluminum Alloy Color: Blue Suitable for: connecting two shafts of different diameters, or connecting the motor shaft or connecting shafts of different diameters. Two screws can be used between the transmission parts to make the model remote control marine propeller shaft and motor power. Package List: 2 * Couplings 1 * Wrench