Review on 🤖 High Performance 97mm Mecanum Wheel Kit with Motor Coupling - 5KG Load Omni Wheel for 2WD/4WD Smart Robot Car Chassis DIY - Ideal for AGV Drift by Malik Munns

Shaft flange and wheel set bolts are all M3 (all required bolts are included to connect a 6mm motor shaft). Minus 1 star for a slight offset in yoke diameter (drilled out very slightly, doesn't affect function) and a Phillips countersunk screw instead of a more professional countersunk screw. Overall the best set of Mecanum wheels you're likely to find on a small robot budget. I recommend using blue Loctite to avoid gladiator fights, tall grass and flamethrowers.