Review on CSLU Tool Titanium Chamfer Chamfering Countersink by Nathaniel Collins

I am very satisfied. I am collecting some binding boards to make hinges for hardcover books. I tried some big box bits and got horrible results due to bit vibration, so I made a very out-of-round hole. They worked well and required no special equipment other than lower speed and feed. First I did it by hand and it worked fine. I used a hand drill at very, very low speed and high pressure. Switched to my drill with 640 rpm and very low speed, it worked even better! It was brass, steel or aluminum not tried yet.