Multi-FunctionWhen air conditioning is installed, expand copper tube, make two copper tube mutual link. (To be installed on hand electric drill.) The flare/swage will keep the coopers' malleability, which will ensure better couplings overall; the process also protects the tube from cracking. Function: When air conditioning is installed, expand copper tube, make two copper tube mutual link. (To be installed on hand electric drill.) SIZE: 7/8"(2 2.2mm/0.87inch), 3/4"(19mm/0.75inch), 5/8"(1 5.9mm/0.63inch), 1/2"(1 2.7mm/0.50inch), 3/8"( 9.5mm/0.37inch), 1/4"( 6.3mm/0.25inch) Height(Approx.): 1/4", 3/8", 1/2", 5/8", 3/4", 7/8" InnovationRevolutionizing system for molding tubes using heat by friction way more surface of between the flare and the Valve.