Opening in the head gives greater access to fittings used on tubingHex shaped heads maintain a more secure grip on fastenersIdeal for use on hex nuts made of softer materialsFlex head wrench ends to access restricted fasteners180° flexible head provides better access to hard-to-reach placesSizes stamped on both sides of the wrench beam for quick identificationManufactured from alloy steel for better strength and longer tool lifeBright, full polish chrome finish wipes easily clean to resist rust and corrosionPlastic wrench rack included for tool retention and storage1/4" x 5/16"; 3/8" x 7/16"; 1/2" x 9/16"; 5/8" x 11/16"; 3/4" x 7/8