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Specification: Type: Couplings Shaft Color: Blue Material: Aluminium Alloy High Quality: Made of aluminium alloy material, light, anti-oxidant, and anti-corrosive, delicate CNC cut with outstanding appearance, high precision fine workmanship, long service life. Function: Used for connecting the driving shaft and the drived shaft of model motors, can convey the driving force steadily in the precise coaxiality. Use: Commonly used for shafts that transmit motion, and widely used in DIY model, such as RC model, car or boat etc. as connector for different parts as joint connector.