I use the Vevor MR-13B. It uses collets to hold the bits while sharpening. I get very good point concentrically, the point is in the center of the bits. I had a drill Dr for a number of years, but it is always hit or miss and more often miss. The MR-13B is very accurate, it will sharpen 118degree and 135 degree cutting angles. They also include two grinding wheels one for high speed steel and a diamond one for cobalt bits.