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