These spring compressors are excellent used these to take a set of MacPherson struts apart. Felt a lot safer using these than the cheaper spring compressors which are liable to slip if you get it wrong. These spring compressors have a safety feature there is a bar that runs from one compressor to the other so they can't move. Also like the clamp on the bottom that locks around the bottom part of the spring. Had no trouble installing the top cap bearing and top mount usually it's a lot of faffing around whether or not the piston will go through all the parts on the top but not with these. I think these are a bargain for what they do. Use some oil or a bit of grease on the threads just to make it easier when crunching the spring up 👍