Air Conditioning Ratcheting Service Wrench and Hex Bit Adapter - Packard PRW516 / PHB316 Used for opening base valves on residential and commercial units Service Wrench - Length: 5 1/2-Inch, socket sizes: 3/16-Inch and 5/16-Inch sq. x 1/4-Inch and 3/8-Inch sq. Adapter has 3/16" and 5/16" hex keys included Quick-flip reversing lever permits instant ratchet reversal Wrench can be used for beam-clamp installation and opening MC / B acetylene tanks