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: The 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).