I have tried 4 brands of these abrasive wheels and Norton is the worst of the 4. They load, burn/melt and then remove no mill scale at all. 3M was the best, then some AvantiPro off the shelf in HD, then ShopSmith, believe it or not, from my local ACE. Last but not least - Norton. I have 4 more of these that I'm stuck on. If I need to remove something very simple it may take me a while to get to one, but I certainly won't be buying more. I've been using their sandpaper for years but it doesn't work.
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