Stretches pipe up to 4-1/4" including stainless steel. Use with an impact wrench to quickly stretch pipe. Plier sets expand pipe from 1-5/8" to 4-1/4". Tool fits can be used in the vehicle. Pipe stretcher kit is a convenient and inexpensive alternative to hydraulic pipe expanders. Comes in a molded storage case. Applications: Expands all types of exhaust pipes, including stainless steel, 1. -5/8" to 4-1/4" size Instructions: Turn the 1-1/8" bolt with a 1/2" or 3/4" impact wrench. If necessary, choose the appropriate aluminum adapter to use with the standard expansion tool. Adapter #3 must be used with adapter #5. Be sure to keep the threads and cone well lubricated.