Obviously they fit the tool well and rotate well around the parts being cut. I've only used them for cutting 1/32" and 1/16" aluminum. They do their job, but wear out pretty quickly. If you're making multiple cuts on a project, plan on keeping a few on hand. I haven't noticed any difference in performance between the ones that came with the saw, the ones I bought at the store and this one. These are cheaper than the big store. If it was a blade for a standard grinder I would probably give it a lower rating but it's the only thing that fits the tool so from that perspective they're fine.
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