Posted by David Williamson on September 21, 2015, 2:17 pm, in reply to "Screwdrivers"
I have used this set numerous times, and have broken a few bits from screws that were "frozen" in. I used the long handled screwdriver with both hands on it and used quite a bit of torque before they broke, but that is what they are made to do.
This is from Wheeler. "Bits are S2 tool steel hardened to 56-58 Rockwell C."