Compatibility: The extension set includes six different specifications, including 7/8 inch, 3/4 inch, 5/8 inch, 1/2 inch, 3/8 inch, 1/4 inch, etc. , which can fully meet your needs in different scenarios. MAIN FUNCTION: Copper tube expander is mainly used to expand copper tube. When installing the air conditioner, the two copper tubes are tightly connected to maintain the ductility of the copper tube and prevent cracking and leaking. MULTI-PURPOSE: The hexagonal handle design of the copper pipe forging drill bit is not easy to fall off when installed on hand tools, and the operation is safer. It is suitable for HVAC installation personnel to extend the air conditioning copper pipe. HIGH-QUALITY MATERIAL: The hexagonal shank flarer is made of bearing steel material, which has high yield strength and resistance to contact fatigue, and is not easy to deform after long-term use, and has stable performance. Easy to carry: The catheter reaming tool is small in size and light in weight, so it can be carried with you or placed in a toolbox without taking up space, which makes it easy to carry and store.