I've got 2 REZ Diamond Wheels and two Kingsley North grinding wheels in my cart. I thought there was a discount for buying 4 wheels, but I don't see that. Is it only for the REZ wheels?

Hi - You would have to order 4 of the same type of wheel. If you had 4 of just the REZ wheels (in various grits or all the same) you would receive a discount but we do not discount across different brands. Sorry!