The first thing I noticed upon opening the package was how fragile the cutting discs are. It broke into three pieces when I inserted the bit into the collet of my rotary tool I tried a different one and, as I do with every bit, before using, I spun my dremel to the lowest RPM setting and aimed away from me I watched it spin to make sure it was "straight". " was. Then I gave it a test (I do this with all bits that are new to me) and tried to cut a piece of cardboard and it cut fine without incident. The package says these bits never go over 34,000 RPM are to be used so be aware of that when using these bits.Apart from the first wheel damage I've had good luck with the bits and will probably buy them again because firstly they s are very cheap (a nice suitcase or a wooden box is not suitable for storage). me with this set) and I only received them a day after I placed my order. Yay.Dremel bits for Dremel tools are always recommended, but these work as a last resort.
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