Description: This item is designed quickly and easily straighten out clamp dent in mufflers and tailpipes.It is just select the correct size expander for your pipe and then insert it in the damaged pipe end, then turn the expanders turning bar till the dents are removed and the pipe is round again just like it used to be. Feature: 1. 3 different sizes make it almost suitable for all kinds of pipes. 2. Used for exhaust system repair and installation. 3. Includes Convenient Carrying Case for Storage. Package Included: 1x Small Expander(1-1/8″ to 1-3/4″) (29-44mm) .