Kokiya 4pcs 80/97mm Omnidirectional Mecanum Wheels with Coupling, C

A 6mm coupling with inner diameter: 6.5mm outer diameter: 80mm thickness: 37mm Omnidirectional small wheel. 80/97mm compatible with 5/6mm hub motors. The latest for omnidirectional movement allows the robot to move not only forward and backward, but also side to side. Perfect for tight spaces. A 5mm coupling with inner diameter: 6.5mm outer diameter: 80mm thickness: 37mm