Mortising drill bit attachement/mount

This is a universal mortising bit holder. It is not attached to the drill machine, but can be held by hand or clamped to the drill/stand.
I used two 626 bearings (19 mm wide, 6 mm hole) and inserted them during printing (two times to set the printer to pause). I think these two bearings keep more stable the bit.
The clamp uses M3 screw (16 mm) and M3 nut (the nut fits very tight and I helped inserting it with soldering iron).
Of note, I have not yet tested drilling a mortise, but looking forward.