Review on Bosch HB136 1 3 Bi Metal Hole by Hugo Caywood

We bought a house and wanted to replace some door handles of an unknown brand with Schlage which required a larger hole through that the knot fits pins. It's pretty hard to do, and if you mess it up, you'll ruin your door. So you use a hole enlarger to keep the center of the hole right where it should be. To do this, use two different hole saws on the hole reamer. The doors I drilled were reinforced with metal and these Bosch saws went through them. It worked like a charm to enlarge the doorknob hole.