wow, never realized how much those reamer bits actually are! i used to drill holes in semi truck frames non stop (probably averaged 30-40 3/4? inch holes per day, for around 6-8 months, each hole required 1 pilot bit, 1 slightly larger bit, and 2 reamers, i probably destroyed 10-15 of the reamers!
they work great till they start to get dull and catch, when that happens, you either break your wrist, get punched in the face or some other sort of nasty... we were using some massive drill for it on this one volvo cube van, single rear axle, that we had put a freight liner dual rear axle on (weight distribution issues) my buddy who was using it was bracing it up against his chest, the bit caught, it picked him up (he was about 220lbs) off his stool, and pinned him against the bottom of the cube box till he realized what had happened and let go of the trigger... damn near knocked him out too... i nearly broke my wrist a few times, took the spade handle to the face once, cut my lip pretty good