The Mecanum wheel is one design for a wheel which can move in any direction.
Brass hex coupling for 38mm plastic omni wheel.
The 4mm universal aluminum mounting hubs for 60mm Omni Wheels, allows you to mount robot wheels and mechanisms to motor shafts. It was designed to connect our 60mm aluminum Omni Wheel 14145 and a motor. The 4mm universal aluminum mounting hubs include one stainless steel hex socket set screw for securing a motor to the hub.