Size: 6 different sizes: 1/4'' (6.35 mm), 3/8'' (9.5 mm), 1/2'' (12.7 mm), 5/8'' (15.9 mm), 3/4'' (19 mm) can meet your different needs. High-quality materials: The copper pipe cutter is made of high-speed steel, which is wear-resistant, not easy to break and has a long service life. Scientific Design: The revolutionary friction forming tube heating system expands the surface area between the bell mouth and the valve. Perfect Tool: Copper pipe expander has perfect depth and tight fit, easy expansion and precise expansion result. Easy to Install: When the air conditioner is installed, expand the copper tube and create two mutual copper tubes. (Install with a hand electric drill). Features: This product is made of Made of high-quality materials, it has a long service life and does not require frequent replacement. When you need to install air conditioners, you can use it to expand copper pipes and connect the two pipes together. It is very easy to use and saves time and energy. It is