Review on Stone Tools ST 63 Variable Bi Metal by Cool Martin

Very disappointed with the quality. Although the teeth appear to be sharp, they only cut through a small portion of the 2x6 before starting to smoke and burn the wood. I had to constantly take off, clean and cool down. I took my time cutting - didn't force it, and there were no nails or screws in the 1-1/2 lumber frame. For comparison, I've used another manufacturer's hole saw for over 40 holes with no problems!