Feature:1. 6PCS IN 1 SET: The kit includes 6pcs copper tube expanders, with different sizes, which can meet different tube expansion requirements.2. MAIN PURPOSE: These expanders can be installed on the electric drill and used to connect 2 air conditioning copper pipes through expansion.3. BEARING STEEL: These pipe expanders are made of bearing steel with high hardness and wear resistance, and are not easy to deform or break.4. STANDARD SIZE: These air conditioning pipe expanders have standard sizes and stable structure to ensure accurate and reliable expansion.5. HIGH EFFICIENCY: Wide pipe expansion range, these pipe expanders have perfect depth, which is conducive to efficient expansion and reduce fatigue.Specification:Item Type: Pipe Expander SetFunction: Installed on the electric drill to connect the 2 copper pipes.Dimensions: 7/8in (22.2mm), 3/4in (19mm), 5/8in (15.9mm), 1/2in (12.7mm), 3/8in (9.5mm), 1/4in (6.3mm)Height: Approx. 4.5cm / 1.8inSurface Treatment: BlackeningMaterial: Bearing SteelNet Weight: Approx. 165g / 5.8oz.Package List:6 x Pipe Expanders