PurposeTo install MS21042 self locking nuts and HI-LOKS on 737-200 And 300 on front spar chord to wing panel join in restricted areaWrench VariationStandardWrench Size3/4Opening Shape12Wrench End TypeBox EndWrench Body TypeOffset-ZDrive TypeInternal SquareDrive Size1/2Head Thickness0.09Offset Angle30Where Used737-200 and 737-300 front spar chordOffset Height2.20