9/16″-12 x 2-1/8″ Zinc Plated Steel Coarse Thread Coupling Nuts (10 pcs.)
Diameter: 9/16″ Length: 2-1/8″ Material: Steel Finish: Zinc Thread Size: 12 (Coarse) Type: Coupling Nut Box of 10. A coupling nut is a long nut tapped from each side to meet in the middle, rather than all the way through in the same direction, used to connect two threaded rods end to end.