Imperial Service Wrench: Chrome, 3/16 in_1/4 in_5/16 in_3/8 in Head Size, 5 1/2 in Overall Lg, Std

These 4-in-1 ratcheting box-end wrenches, also known as HVAC wrenches or refrigeration wrenches, have a 6-pt. box end design that allows more contact with the fastener's sides than the 12-pt. style and prevents rounding the fastener's corners. The 4-in-1 style 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.