Stretches All Pipe Including Stainless Steel. Use with an impact wrench to quickly stretch pipes. Two collet sets fit pipes from 1 5/8ins to 2 7/16ins. Can be used on the car. The pipe stretcher is a convenient, inexpensive alternative to hydraulic pipe expanders. Additional collets (5) extend range to 4 1/4ins. (Not included in 34400 set.)