7/8"-9 x 2-3/16" Zinc Inspection Hole Coupling Nuts (10 pcs.)

Diameter: 7/8"
Length: 2-3/16"
Material: Steel
Finish: Zinc
Driver Type: 1-1/4" Wrench
Thread Size: 9 (Coarse)
Style: Inspection Hole and Stop
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.