Stanley Proto J1112 Refrigeration Wrench, 1/4-Inch by 3/16-Inch Square/ 1/4-Inch by 3/16-Inch Hex,Stanley Proto,J1112" /> Full polish finish provides corrosion resistance and easy to clean surfaces Designed for servicing automotive, commercial and residential air conditioners, refrigeration units and freezers Hex openings are used for packing gland fittings, mounting bolts, clutch bolts, tubing fittings, dust cap nuts and oil check plugs Square openings are used on male service valves, plug fittings, compressor valves and refrigerant charging tanks Reversing switch lever allows for easy changes in turning direction which helps improve speed