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Note low RPM listing
on September 15, 2010
While these are offered as being compatible with all rotary tools, the package states they must be used at low RPM. This is contradictory since rotary tools run in the 5000-30000 RPM range. Another reviewer stated they were listed at 1500 RPM. I did not see that in the ad or on the package. But the low RPM warning is on the cardboard package back along with a requirement to always use water lubricant. By comparison, the comparable Dremel 545 is listed as 15000 to 20000 RPM.
On another subject, other reviewers have said they don't hold up well cutting screws or metal. They are not intended for metal. They are suitable for concrete, brick, porcelain, ceramics and tile.
Update on usage. Someone commented on this review asking how well they actually worked in comparison to the Dremel 545. They work very well. I installed subway tile as a kitchen backsplash. The tile surface ends as the backsplash reaches a window frame. I did not installed the window trim until AFTER the tiles were already solid on the wall. And to place the trim properly, I had to trim off 1/8" of the tile the full height of the backsplash.
I applied a piece of painters tape to maintain a straight line and cut straight up all the tiles. But since this cut requires the Dremel tool to lay flat against the wall while cutting, the larger diameter of the Dremel 545 is essential to get a cut that was perpendicular to the wall.
As I just explained, a key comparison involves the diameter of the disc. The Dremel disc is roughly twice the diameter. If you picture the small disc installed on your Dremel rotary motor tool, you can imagine that the larger Dremel disc would give you a greater depth of cut. Cutting flush to the wall surface with the small disc would be nearly impossible. You would have to lean your Dremel motor into the wall and you would get a cut that was not perpendicular to the wall. (Dremel 545 disc is 1.5" diameter while this disc is 7/8" diameter.)
On the other hand, if you are cutting tiles BEFORE they are installed on the wall, these small discs work perfectly well.
There is no question the Dremel 545 is superior quality and functionality. BUT this product does work adequately and is a bargain at the price offered.