At $7.00 each, they're half the price of the 3M product. Although not a quick change, but this small inconvenience is insignificant. I've used both and there is no difference in performance or durability. Wearing a respirator and a full face mask, I was scraping several layers of 100+ year old weathered paint off an old house. The guard must be removed from the grinder (use it with full attention as it is dangerous) and the disc must be pressed against the surface and keep moving, and with a light touch even soft cedar can be cleaned without squeezing it out . Don't try to use discs on small parts or complex moldings, they will eat them up, but this is the best method for use on flat or large convex surfaces. Practice on the crowbar first. Vacuum pick-up is recommended (and may even be mandatory) for large-scale use. Dust, especially from lead paint, is a serious health hazard. Avoid encountering sharp edges and protruding nails that could tear the panes apart.
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