My grinder uses a 1/2" axle so I had to use a plastic ring to mount it (otherwise the mandrel size is 5/8". ) . The shim was too thin (the grinding wheel I removed was 1/2" thick, that's 5/16" at best, maybe? The shim is in place. I was concerned that the extra space in the wheel housing would reduce the Would cause wires to come apart but it didn't, they held their shape quite well which is really good as it doesn't scratch the inside of my wheel well I was afraid it would put extra stress on the motor and had no problems even after a while Used to remove rust from some tools it held its shape fairly well Make sure you use the correct mandrel size otherwise you get a heck of a lot of vibration which I was expecting All in all a great product brush for the price Dewalt wheels look better but I can buy 3 of these for the price of one Dewalt hence the 5 star rating.
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