[6 Pipe Sizes & 5-in-1 Bit Combinations] 6 different sizes of drill bits, including 1/4Inch, 3/8Inch, 1/2Inch, 5/8Inch, 3/4Inch, 7/8Inch, and 1pcs 5-in-1 flaring tool. These expanders are designed with hexagonal shank and are suitable for installation on manual electric drills. Our pipe expansion tool are an essential accessory for servicing air conditioners. [High Quality Bearing Steel] The swaging tool drill bits are made of and wear-resistant bearing steel which help prevent the boring drill bits from rusting, and has a long service life. [Small Size and High Efficiency] Compared with traditional manual copper pipe swaging tool , our electric boring drill bits are small in size, easy to carry and easier to use, no need to vigorously expand the copper pipe hole, with the electric drill with our drill bits, you can easily expand the hole diameter. The force of the electric drill bits are uniform, which not cause the copper pipe to break, or not round and smooth. [Function] This swage