Description:Brand new and high quality

Made from high quality brass material, and the coupler is steady, reliable and strictly functional

Used for connecting the motor shaft and the hexagon wheel of the machine, robot, toy cars, boat propeller shaft, etc

There is cushioning, vibration and improve the dynamic performance of the shaft

Great for RC model cars, robot and etc

Specification:Material: BrassShape: HexagonShaft Diameter: 3mm, 4mm, 6mm, 7mm, 8mmTotal Length: 18mm/0

71''Diameter of hexagonal part: 12mm/0

47''Screw hole diameter: M4 (4mm)Package Includes:1 Piece Coupling1 Piece Hex Wrench2 Pieces ScrewsNote:As different computers display colors differently, the color of the actual item may vary slightly from the above images

There is 2-3% difference according to manual measurement

Please check the measurement chart carefully before you buy the item