Overall, excellent value for money. They do a pretty good job of removing rust and paint from steel. I used them with a rotary extension bench grinder (from Harbor Freight Tools). They wear out quickly and wires literally fly off, so dress accordingly. The first two times they literally fly right in and through my shirt. I would perhaps recommend a leather or coarse knit work apron, e.g. B. a welder's apron. On some I noticed that the head was not quite balanced (by weight) and at certain speeds this led to vibrations which were also visible. I don't think they are as high quality as Dremel branded products but they do their job quite well and even if they are only 1/2 the quality (how long it lasts) they are about 1/4 less or less. tool price.
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