First question would be what in the world do you need a refrigeration wrench for. You can purchase a refrigeration wrench at JOHNSTONE SUPPLY or from GRAINGERS or any other refrigeration warehouse that sells heating cooling and refrigeration supplies to the general public. In the refrigertaion industry we use the wrenches to gain access to the refrigeration system. It's is a box end type of wratcheting wrench with dual openings on each end. The openings are square in shape and are primarily used to open service valves in either air conditioning systems or on refrigeration systems at the compressor. I would caution you not to try to attempt any refrigeration or air conditioning components if you are able to obtain this wrench as the sytems are under pressure.