Circular Abrasive Polishing Thickness Hardness Review

The disc cuts quite well, but the fibers are loose. The wheel quickly crumbles into a cloud of abrasive dust when a piece of steel is pressed against it. This wheel is best used with a vacuum nozzle. My understanding is that the "P" rating denotes this condition (wheel hardness?) and I already have another wheel with a higher P rating. I usually get a few years off of 3M or Beartex wheels, I doubt that this takes longer than a month or two but the price matches the quality.