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 Set Function: 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 / 1.8in Surface Treatment: Blackening Material: Bearing Steel Net Weight: Approx. 165g / 5.8oz. Package List: 6 x Pipe Expanders