Feature: **Swaged toolThe product of the shaping process, the tool goes into the HVAC system. **MaterialForging spinning tool is made of high carbon steel, which is durable and not easy to break, and wear-resistant. **5 Different Sizes 5 swaged tool bits in common HVAC pipe diameters: 3/4" (19mm), 5/8" (15.9mm), 1/2" (12.7mm), 3/8" (9.5mm) ), 1/4" (6.3mm); Total length: 63/61/56/53/50mm. ** [Function] When installing the air conditioner, expand the copper pipe to connect two copper pipes together. Standardized for hard and soft copper, easy to loosen forgings.(Must be installed on the hand drill.)** Easy to installThe tool drill needs to be installed on the hand drill. Perfect for installers whether you are just learning or doing it all the time time. Specification: ** Material: High Carbon Steel ** Size: 3/4" (19mm), 5/8" (15.9mm), 1/2" (12.7mm), ** 3/8" (9.5mm) , 1/4" (6.3mm) ** Total length: 63/61/56/53/50mm ** Color: black ** Quantity: 5 pcs Packing list: 5 * reamer