Hard-to-Find Fastener 014973403355 Coarse Rod Coupling Nuts, 3/8-16, Piece-18 Diameter: 3/8" Length: 1-3/4 inch Material: Steel Finish: Zinc Driver Type: 9/16" Wrench Diameter 1: 3/8 Inch Diameter 2: 9/16 Inch Length: 1-3/4 inch Material: Steel Finish: Zinc