Bought thought I'd use it once and if it breaks or wears out no big deal. They are damn well made, the different sizes helped a lot because of the placement of the oxygen sensors. An oxygen sensor is rusty and stuck there. I put a lot of effort into these tools to get them out and they didn't break or break and I ended up getting the damn thing out. I was sure he would at least scatter and rip off the O2 sensor but they held up perfectly. worth 20 dollars.