BUTTERFLY SOCKET SETFeatures and Benefits: - First ever closed ring socket specifically for use on seized track rod locking nuts - For use with hydraulic, A/C and plumbing fittings, tie-rod ends, O2 sensors and diesel injectors - Sockets fit both Metric and SAE size fasteners - Unique nut drive surfaces enable even damaged or worn nuts to be operated with confidence - Flat square drive socket design allows for use where access cannot be gained using conventional socketsSizes include: 11mm (7/16"); 12-13mm (1/2"); 14mm (9/16"); 16mm (5/8"). Square drive can be used with torque wrench or breaker bar for precise tightening. 4 piece set is packaged in durable EVA foam.