I almost always hit it on cement.
I broke at least 3 (not mine
), by using them on concrete or steel.
But, I now keep a section of a laminated wooden beam (~4"x9"x14") in my reloading room. It serves two purposes for 'kinetic' bullet pulling:
1. Saves the puller.
2. Lets me drive the puller "through" the beam, without smashing my knuckles on the floor. (A technique that is far superior to the standard 'hesitate and flick' method most people use. - I used to do it, too.)