
This is a hexagonal brass coupling that can be used to connect the motor with the corresponding shaft diameter (4mm\5mm\6mm) and the corresponding hexagonal wheel:
Robot cars Wheel-68mm-Hexagonal
Robot cars Wheel-72mm-Hexagonal
Robot cars Wheel-130mm-Hexagonal
1 x 6mm Brass Hex Mounting Hub
1 x M3*6mm
1 x M4*6mm
This is a hexagonal brass coupling that can be used to connect the motor with the corresponding shaft diameter (4mm\5mm\6mm) and the corresponding hexagonal wheel: