So we've never used a concrete grinder before. So maybe this is normal but for the price which was close to $150 for two sets of three pads, I expected them to last longer. Our concrete slab is 18x45 and the pads were completely wore down to zero before we got finished. We had to go out and buy another set of singles from the rental place that we rented the grinder from so that was another $130 and they wore out once again before we even got finished going over it for the second time.
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