Hard-to-Find Fastener 014973284763 Coarse Nylon Insert Lock Nuts, 1/4-20, Piece-100 Diameter: 1/4" Thickness: 21/64 inches Material: Steel Finish: Zinc Driver Type: 7/16" Wrench Diameter: 1/4" Material: Steel Finish: Zinc Driver Type: 7/16 Wrench Thread Type: 20 (Coarse)