The pipe stretcher kit is a convenient, inexpensive alternative to hydraulic pipe expanders. The pipe strechers can be used with an impact wrench to quickly stretch pipes. The set includes stretchers of various sizes, expanding pipes from 1-5/8\" to 4-1/4\". All types of exhaust pipes can be expanded by the stretchers, including stainless steel ones. The tool set can be used on vehicles as well. Note: Be sure to keep threads and cones well lubricated during operation.