uxcell Hex Coupler 4mm Bore Motor Hex Brass Shaft Coupling Flexible Connector for Car Wheels Tires Shaft Motor 8pcs

Description :
1.Material: Made of pure brass, sturdy, reliable and strictly functional.
2.Function: A special coupler, used for connecting the motor shaft and the hexagon wheel of the robot, cars, and other models.
3.Use: Suitable for model shaft connection, perfect accessories for RC Model motor, etc.
4.Feature: Durable and insulation, make your shaft more stable, easy to install and replace.

Specification :
Hexagonal Side: 7mm
Hex Height : 6mm
Opposite Side: 12mm
Cylinder Height: 12mm
Cylinder Outer Diameter: 11.5mm
Cylinder Inner Diameter: 4mm
Fastening Screw Hole: M4