3pc Exhaust Tail Pipe Muffler Expander Spreader 1-1/8" to 3-1/16" Drop forged, heat treated steel. Works With All 1-1/8" to 3-1/2"ID. Thin Wall Pipes A Simple Wrench Turn Expands Pipe for Exhaust System Repair and Installation Designed to Quickly and Easily Straighten Out Clamp Dents in Mufflers and Tailpipes For use on all types of tails pipes, mufflers, and exhaust systems.