Bought a set of these to use on my Tamiya M-05, I guess you get what you paid for. One of the adapters had a bore too small to fit properly over the wheel axle, which made it unusable at all. It's not the problem with the axle as the other three fits fine wherever I use them. Other than that, the inside ridge (sitting on the inner bearing race) is a bit too short so the adapter may come in contact with the outer race of the bearing or wheel hub.
i use this to go with my colt rx7 210mm bodies
used this to fill the fender caverns.. because the colt rx7 body is so wide it needs +10mm wheel offset and 6mm hex.. that is what i use to get a full flushness look on my drift bodies
The plastic one keep getting stuck in the rims. This is tough in between heats. So I just bought these now. I use 5mm in the front of the car and 6 mm in the back. Some times on Tamiya cars the 30mm sponge in the back can touch. The RC Mart sets and prices are great