"Features: Use this tool to stamp the product into the line group of the HVAC system. After installing the air conditioner, extend the copper pipe to connect the two copper pipes to each other . Needs to be installed on the hand drill. Only the pipe expander, does not include other accessories shown in the picture. Various sizes: 7/8" , 3/4", 5/8", 1/2", 3/8", 1/4", each pack has 6 different sizes for you to choose to meet your needs. Easy to install , whether you are learning or have completed the installation, it is very suitable. < p> Features: < p>Material: 45# steel (bearing steel), durable and not easy Broken, wear-resistant. Height: Approx. 45mm/1.77in; 50mm/1.97in; 55mm/2.16in p> Dimensions: 7/8"" (22.2mm), 3/4"" (19mm), 5/8"" (15.9mm), 1/2"" (1 2.7mm), 3/8"" (9.5mm), 1/4"" (6.3mm)< /p> Color: As pictured Package includes: 6pcs/set x Hose expander Note: < p>1, due to manual measurement, please allow 0-1cm error. Please make sure you don't mind before bidding. 2. Due to the difference of different monitors, the picture may not reflect the actual color of the item. Thank you! "