1/2"-13 x 1-3/4" Hot Dip Galvanized Inspection Hole Coupling Nuts (20 pcs.)

Diameter: 1/2"
Length: 1-3/4"
Material: Steel
Finish: Hot Dip Galvanized
Driver Type: 7/8" Wrench
Thread Size: 13 (Coarse)
Style: Inspection Hole
Type: Coupling Nut

Box of 20.

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.