Pack with screws, no hub needed.
One pack include:
omni wheel 4pcs
M3*20mm copper pipe 4pcs
M3*25mm screw 4pcs
M3*30mm screw 4pcs
tapping screw 4pcs
There are 4 sections in the wheel; each section has 3pcs rubber connecting each other by a 3*25mm spacer.
Each section runs smoothly on the wheel hub.
It uses high quality rubber; ensure the long life usage, strong wearing capacity.
Good friction on each side of the wheel.
HOW TO USE:
Inner diameter: 4mm
1. In the packing, it comes with a 3*20mm spacer assembly in the center of the wheel, and put a long screw (not included) through the hub. Then it becomes a driving wheel.
2. Or assembly the wheel in the 4mm motor shaft.