General description The Exhaust Pipe Stretcher Expander Tool Kit is designed to extend exhaust pipes from 1-5/8 inches to 4-1/4 inches, making it an essential tool for automotive repairs and modifications. Technical specifications Material: Aluminum 6061, 40Cr Alloy Structural Steel Expanding Range: 1-5/8" to 4-1/4" Drive Expanding Tool: 3/4″-16 Thread Small Steel Collet: 1 5/8" - 1 7/8" Large Steel Collet: 2" - 2 1/2" Collet: 2 3/8" - 4 1/4" Compatibility and accessories Includes 7 Collets for various sizes: 1 5/8in - 2in, 2in - 2-1/2in, 2-3/8in - 2-3/4in, 2-3/4in - 3-1/8in, 3-1/8in - 3-1/2in, 3-1/2in - 3-7/8in, 3-7/8in - 4-1/4in Package includes: 1 x Exhaust Pipe Expander Tool Kit (7 Pcs), 14 x O Rings, 1 x Box