I have a tool cabinet that needed to be slid under the kitchen counter. The heavy duty wheels that came with the cabinet made it too big to fit under the countertop, but the regular small casters were too weak to support the cabinet's weight. I solved the problem by doubling the number of wheels on the base to eight with two sets. They worked great! I block the four front wheels and the cabinet stays put. However, when I unlock it, I can pull out the cabinet from under the counter, temporarily doubling the worktop space in my kitchen when we have people and need more space for pots and salad bowls.