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Specification: Type: Couplings Shaft Model: 5mm to 8mm Outer Diameter: 14mm Length: 25mm Mounting Hole: M4 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. Package Includes: 2 x Aluminium Alloy Couplings 8 x Screws 1 x Wrench