1/4"-28 x 7/16" x 7/8" Zinc Rod Coupling Nuts (12 pcs.)

Diameter: 1/4"
Length: 7/8"
Material: Steel
Finish: Zinc
Driver Type: 3/8" Wrench
Thread Size: 28 (Fine)
Style: Hex
Type: Coupling Nut

Box of 12.

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.