The hooks on these tools melt quickly if you try to use higher vibrations. I used them to replace the ones that came with my rocker. They fit well, are designed for multiple uses (if you use little and slowly) and are much cheaper than other similar products. I tried comparing another brand to compare durability and got almost the same result. So this problem seems to be related to this feature of oscillating tools. So if you don't expect them to last more than a few hours of grinding, they're good for getting into those hard-to-reach places that a large grinder won't fit. They'll likely last a lot longer if you only need to sand lightly.
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