Backside counterbore - GIF

[nova_robotics]

I have three of these. Small, medium and large. They're great. They're so good at deburring that I use them for regular stuff that's easily accessed with normal tools. I highly recommend this tool to everyone. The only problem is there are intermediate sizes that is too large for the smaller one, and too small for the larger one. You would think they would make many sizes available to cover every hole size. They do not. Some sizes of hole simple cannot be deburred with this tool. Annoying, but otherwise a great addition to your toolbox.