Packag Include: 1x Small Expander: 1-1/8" to 1-3/4" (29-44 mm.) 1x Medium Expander: 1-1/2" to 2-1/2" (38-62 mm.) 1x Large Expander: 2-1/8" to 3-1/2" (54-87 mm.) 3x O ring elements (1 for each other) 1x Carry Box Material: drop forged steel This expander is designed to straighten out clamp dents in muffiers and tailpipes quickly and easily. A simple wrench turn will expand pipes for exhaust system repair and installation. Features Brand New And Durable. Easy To Use. High Strength and Good Toughness. Consistent enlarging of exhaust tubes 3 Different Sizes Make It Almost Suitable For All Kinds Of Pipes. Used For Exhaust System Repair And Installation. Ideal for repair or elimination of leaks Drop Forged And Heat Treated. Ensures A Perfect Fit With Pipes Without Leaks.