1. WIDE APPLICATION This tail pipe expander kit includes three different expander sizes to fit all 11/8' to 31/2' id thinwall pipe. 2. A MUSTHAVE TOOL The 3Piece Expander Expander Tool Set is designed to quickly and easily straighten pinch marks and pinch marks in s and tailpipes, and stretch pipe openings or repair damaged pipe ends. 3. CORRECTLY USE OF TOOL Applies only to all thinwalled tubing from 11/8' to 31/2' ID. Can be used with hand ratchets or breaker levers and hand wrenches, but avoid electric ratchets to prevent damage to pipe expander tools from excessive force. 4. PREMIUM QUALITY 1 Small Expander: 11/8' to 13/4', 1 Medium Expander: 11/2' to 21/2', 1 Large Expander: 21/8' to 31/2, 6 additional orings. The extender is made of highquality carbon steel and has passed rigorous quality inspection to provide strong sturdiness and durability, for professional mechanics and personal repairs.