Review on Enhance Your Woodworking Skills with Drill Master's 3-Piece Spiral Mortising Set by Joseph Reed

These bits are of very little use. I wouldn't go so far as to say they're rubbish, but they're not much better. They're very good at drilling holes straight down (which is why this rating is 2 stars and not 1 star), but if you use them to route a jig, even at the smallest depth, they dull SUPER quickly with each pass . I had burned out the plywood after two passes that were about 20 inches long and only removed 1/8 inch with a 1/2 inch bit. I would return them but I don't have a return window. Save yourself the headache and just buy MLCS Carbide Twist Bits for about $90.