Hard-to-Find Fastener 014973261849 Grade 8 Fine Hex Nuts, 9/16-18, Piece-10 Diameter: 9/16-Inch Material: Steel Finish: Yellow Zinc Driver Type: 7/8 Wrench Thread Type: 18 (Fine) Diameter: 9/16" Material: Steel Finish: Yellow Zinc Driver Type: 7/8 Wrench Thread Type: 18 (Fine)