[Material]: Made of carbon steel with black oxide smooth finish, long service life and easy to use.
[Function]: When air conditioning is installed, expand copper tube, make two copper tube mutual link.
[Easy To Use]: It needs to be used with power tools such as hand electric drill, saving you time and improving work efficiency.
[Heat by Friction]: The drill expander for molding tubes using heat by friction way more surface of between the flare and the Valve. Preserve copper malleability during the molding process, for a leak-tight fitting.