[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, 1/4inch and 1pcs 5 in 1 flaring tool. These expanders are designed with hexagonal shank and are suitable for installation on various 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 durable 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 HAVC, 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 will not cause the copper pipe to break, or not round and smooth. [Function]This swage tool can expand the copper pipe, so that you can link the two copper pipes to each other. It is great for air conditioning repairs. But please note that the drill speed should not be too fast.This tool maintains the ductility of copper aluminum during die forging to avoid cracks and leakage. [Use Easier] It is very suitable for HVAC installers to perform air conditioning copper pipe expansion operations without complicated learning. (Please wear anti-scalding gloves, goggles and other safety protective equipment during operation.) The curvature of the flare allows the drill to gently expand the copper tube to the specified inner diameter. Please note: Slight color difference or difference in kind, slight color difference or difference, does not affect the use, please do not mind, thank you! Colour:wine red + black Mate