simple tool that works well its a tire depth gauge works pretty good although only get one not a box of new item easy to read just your average tread dept gauge no complaints tire depth gauge had to be modified to use it will not work on a 4 valve ford motor great tool for the job the new version of this tool stinks valve spring compressor its the only choice you have for a correct tool one star good quality easy to read and accurate made in usa and easy to use but the markings are slightly off