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 tray included for tool retention and storage9mm x 11mm 10mm x 12mm 13mm x 14mm 15mm x 17mm 16mm x 18mm; 19mm x 21mm