Convenient Storage: Our exhaust pipe spreader dies are packaged in a plastic box. The box with a hydraulic pump is stored in an iron box, thus providing double protection. The toolbox is portable and easy to carry. Heavy-duty Construction: All collets are made of Aluminum alloy, ensuring rugged rigidity over an extended service life. The coated surface of the exhaust pipe expander kit provides rust resistance. Easy to Install & Operate: Different sizes of collet need to be matched with specified collets. Details are provided in the picture. You need to assemble the expanding part with a hydraulic mechanism and insert it into the pipe. Labor-saving Hydraulic System:This muffler pipe expander forces pipes to expand by using an air hydraulic mechanism. A 10-ton air hydraulic foot pump with a 6 feet high-pressure hose makes your expansion effortless. Wide Expanding Range: The hydraulic exhaust pipe expander provides various collets for a broad expansion range from 1-5/8" to 4-1/4". Includes: mild steel expander (1 5/8" - 1 7/8" collet, 2" - 2 1/2" chuck), and aluminum alloy expander (2 3/8"- 2 3/4" Collet, 2 3/4" - 3 1/8" collet, 3 1/8" - 3 1/2" collet, 3 1/2" - 3 7/8" collet, 3 7/8" - 4 1/4" collet).