5/8"-11 x 2-1/8" Hot Dip Galvanized Steel Coarse Thread Inspection Hole Coupling Nuts

Diameter: 5/8"
Length: 2-1/8"
Material: Steel
Finish: Hot Dip Galvanized
Driver Type: 15/16" Wrench
Thread Size: 11 (Coarse)
Style: Inspection Hole
Type: Coupling Nut

Box of 15.

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.