When IBM switched from Excelite to Snap-on screwdrivers they got nicknamed "Snap off". The tips were hard enough to last forever, unless you put too much torque on them or tried to pry something with them.
The problem was so bad they ordered thousands of blades with a softer temper and told us how to drive off the handle and drive in a new blade. I am not sure how many actually got fixed but there were always a couple spare blades laying around.
