Just a heads-up. These are CR-V and not CR-MO. IMO, Impact Sockets should be CR-MO.
I had to look that up
They are just black painted chrome sockets. Most would never recommend Cr-V for heavy impact duty… and you better be wearing safety glasses if you do. (not that you shouldn’t be anyway) 
I’ve been using these - https://www.harborfreight.com/12-in-drive-sae-impact-deep-socket-set-13-piece-69560.html - and their metric cousins in my small engine shop for almost 15 years now. I have always used them with a DeWalt 20v impact or a commercial pneumatic impact wrench. Same two sets and I’ve never broken a single one. I’ve never even had to get any of them replaced under their lifetime warranty
- Chrome vanadium steel construction
- Black phosphate finish to resist corrosion
Small engine shop is NOT heavy impact. Send 'em my way and I’ll video one breaking on a corroded trailer.
Then you’ve never seen come of the ATVs I’ve had come through here
I could snap either type impact socket if I wasn’t careful.
Unbolting a 40 ton rooftop unit that hasn’t moved off of the roof for 35 years…
You need to use heat, diesel, heat again, try loosening & tightening it, repeat because you don’t have room to cut them off and you really don’t want to break the only socket you brought to the roof…
oh, I’ve been told (usually by my dad) that I could tear up an anvil 
Yeah, repeatedly dropping them on Plucky will break them.
