Dear customers, We hope to bring you a satisfying shopping experience. Some unexpected factors we may not control, but we will do our best. If you have following problems: Wrong item sent, Arrived damaged, Not received, Missing parts or pieces, Not as described, Not working or not authentic, before you choose to open a return request or leave a feedback, pls feel free to message us , we will reply you in 24 hours. Hope you can find what you want here and enjoy your shopping. FUNCTION : Impact driven Heavy-Duty expander allows for fitting smaller exhaust piping and making exhaust seals. EASY TO USE : First step: Choose the proper collet. Second step: clamp the pipe. Third step: and then expand the pipe. Use a 1/2″ or 3/4″ impact wrench to save even more effort. SIZE : Steel expander 1 5/8″ – 2″ Collet, Steel expander 2″ – 2 1/2″ Collet, 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. MATERIAL : Collets is made of 6061 Aluminum, use oxidation treatment.The expander utilizes Tempered 40CR Alloy Structural Steel, using quenching and phosphating treatment. Fumrtcy’s Guarantee : Give you perfect user experience, whether you are master or DIY novice. If you have any question, please feel free to let us know. Product specification: Fumrtcy Exhaust Expander Tool Includes common tools needed to solve exhaust pipe expansion work. Matches most models on the market. Refer to the size table for details. Collet: 1 2 3/4″ – 3 1/8″ Collet 2 3 1/8″ – 3 1/2 Collet 3 3 1/2″ – 3 7/8″ Collet 4 3 7/8” – 4 1/4 Collet 5 2 3/8″ – 2 3/4″ Collet expander drive: 6 Large Steel Collet 2-2 1/2″ 7 Small Steel Collet 1 5/8″ 1 7/8″ Bolt: 10 28 mm Drive Expanding Tool Component matching: First step: Choose the proper collet. Second step: clamp the pipe. Third step: and then expand the pipe. Use a 1/2″ or 3/4″ impact wrench to save even more effort. Keep in mind: The 6 Large Steel Collet can used alone or with the 1 & 3 collets. The 7 Small Steel Collet can used alone or with the 2 & 5 collets. The 4 collet must be used with the 2 collet.