With this efficient assembly tool, the job of replacing a mount valve springs would be much easier and faster. This tool consisted of two parts: a 12 inches steel leverage head and 9 inches metal bar with a smooth rubber handle. These two parts are detachable using to give enough leverage to the stud keepers Easy install valve keeper Save-effort Springs compressor When you compress the springs, you can keep them in a lock position, then you can reinstall the keeper through the both-hand operation.