PurposeTo tighten 737 "R4" fitting 9/16 12 pt bolts third from most forward, inboard and outboardWrench VariationStandardWrench Size15/16Opening Shape12Wrench End TypeBox EndWrench Body TypeOffset-ZDrive TypeInternal SquareDrive Size3/4Center-to-Center Distance3.00Head Thickness0.60Used WithTorque WrenchWhere Used737 "R4" fittingOverall Length4.60Fastener NumberBACN11Z