I couldn't get it to work. I have old junk on my ranch. It has special lock nuts and we lost the key. Initially we didn't buy them, so it was impossible to find a replacement. I had an apartment and needed to find a way to remove the lock nut. It's not registered so I couldn't take it to a tire shop. There are two sizes in the pack. They have an internal thread and must be "screwed" onto the nut. One was too big and the other seemed too small, but it might have taken an impact wrench to tighten it. I couldn't get it to work. I ended up just taking a 12 point head a little smaller than a nut and hammering it in.