Mecanum Wheels Specs

For the product:

100mm Mecanum Wheel Set (2x Left, 2x Right)
Product code : RB-Nex-13

What is the size of the motor drive shaft that will fit into these wheels?

Thanks!
MV

The wheels are not meant to connect to a shaft directly - you need one of the following hubs:
6mm Set Screw Hub
8mm Set Screw Hub
10mm Set Screw Hub
12mm Set Screw Hub