These ratcheting box-end wrenches, also known as HVAC wrenches or refrigeration wrenches, have a 4-pt. box end design that allows more contact with the fastener's sides than a 6-pt. or 12-pt. style and prevents rounding the fastener's corners. They can be used on square fasteners and have a 4-in-1 style that allows the wrench to be flipped over to access a total of four different SAE (inch) size fasteners. The ratcheting box ends have a gear mechanism that allows the wrench to rotate freely in one direction without removing the wrench head from the fastener and repositioning the wrench. Box-end wrenches can access valves on residential and commercial refrigeration units.
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