[Working Principle]: The soft copper pipe is expanded by the rotation of the drill bit, so that the two copper pipes are connected without leakage. More effective than circular reamers when used in combination with drill bits and impact drills. (The drilling speed should not be too fast) [Size]: The pipe expander tool has 11 sizes: 3/4Inch, 5/8Inch, 1/2Inch, 3/8Inch, 1/4Inch, S 7/8, S 3/4, S 5/8, S 1/2, S 3/8, S 1/4 [Easy to Use]: According to the diameter of the copper pipe expander, select the corresponding expansion head to install. To prevent cracking at the edges of the tube, the tip of the expander should be used to expand the tube. Then insert the entire expansion head into the copper tube and apply even force until the cup mouth is formed. [Material]: The copper pipe reamer is made of metal, which is not easy to break, wear-, prevents the pipe drill bit from rusting, and has a long service life. [WHAT YOU GET]: This flaring tool kit contains 6 straight holes, 5 flared holes, Manufacturer: Akfldms