I just talked the guy that's building my bumper into buying a set. It didn't take a lot of persuading. I think he said 1", 2", 3" and he was explaining to me there are different types. He bought some that would operate with an impact wrench, so he could do existing panels. Sounds cool. I hope to take my rig to him in a week or 2, so I'll post details about what he bought...