Review on SPTA Carbide Engraving Woodworking Drilling by Ralph Gerry

The bits themselves are fine and will do what is expected if the expectations are reasonable. By reading the booklet that accompanies the Dremel tool, the owner will have the appropriate expectation. I'm deducting stars for using the term "carbide" in the listing title. These bits are made of high speed steel, not tungsten carbide. If you treat them like carbide you will damage the bits and the workpiece (and possibly the Dremel and yourself). In addition, there are no ball bearings in the guides. If he says this is the case (some listings that look like the same item have such claims) then it is inaccurate. Pilots are simple, smooth, high-speed steel cylinders. Keep the parts that move them or you will have small bumps in your work.