QBace 3pc 1-1/8 to 3-1/2 3pcs Car Tail Pipe Expander Tool Kit Sizes 1.1/8 to 3.5 inch Drop Forged Heat Treated Steel. Easily Straighten out clamp dent in mufflers and tailpipes Simple Wrench Turn Expands Pipe For Repair. Works With all 1.1/8 - 3.5 inch Thin Walls. Small Expander 1.1/8 - 1.75 inch. Medium Expander 1.5 - 2.5 inch.