Feature: 1. Applicable Range: With various collets for a broad expansion range from 1‑5/8in to 4‑1/4in. Includes: Steel expander 1 5/8in‑2in Collet, Steel expander 2in‑2 1/2in Collet, 2 3/8in‑2 3/4in Collet, 2 3/4in‑3 1/8in Collet, 3 1/8in‑3 1/2in Collet, 3 1/2in‑3 7/8in Collet, 3 7/8in‑4 1/4in Collet. 2. Automatic Pipe Expansion Kit: This tool kit provides the convenient collets and expanders needed to stretch tail pipes before making tight seals to pipes with smaller diameters, ideal for home DIY or professional auto shop. 3. High Quality Materials: All collets are constructed from aerospace grade 6061 aluminum, while the expander adopts tempered 40CR alloy structural steel, high hardness, ensuring robustness over the long service life. 4. Equipped With Storage Box: Ideal for fitting aftermarket exhaust components to standard exhaust pipes, includes a handy tool storage case for easy storage of tools, and easy for you to carry. 5. Simple Operation: You just need to choose the appropriate collet, clamp the tail tube, and expand the tube, the operation of our stretcher kit is really simple. Specification: Item Type: Exhaust Pipe Expander Tool Set Material: 6061 Aluminum + Steel Alloy Applicable Range: Suitable for a wide range of extensions from 1-5/8in to 4-1/4in Application: Universal type for automobiles and motorcycles Characteristic: 1.This mechanic’s tool kit provides the handy collets and expander required to stretch tailpipes before making tight seals to pipes with smaller diameters. Perfect for home DIY or professional auto shops. 2.The exhaust pipe stretcher offers various collets for wide expansion range from 1-5/8in to 4-1/4in. Includes: Steel expander 1 5/8in - 2in Collet, Steel expander 2in - 2 1/2in Collet, 2 3/8in- 2 3/4in Collet, 2 3/4in - 3 1/8in Collet, 3 1/8in - 3 1/2in Collet, 3 1/2in - 3 7/8in Collet, 3 7/8in - 4 1/4in Collet. 3.A depandable bearing adjusts the drive motion and smoothens your pipe stretching process. Resisting deformity under heavy loads, it's a high performance work horse that saves you time and effort. 4.If you're looking for the most durable stretcher kit out there, you should know our collets are made of aerospace grade 6061 Aluminum, while the expander drive is built tough with 40CR Structural Steel Alloy, ensuring heavy duty service with Chinese GB standard.. Package List: 1 x Exhaust Pipe Expander Tool Set (7pcs)1 x Pack of Rubber Ring (14pcs)1 x Storage Box