Hard-to-Find Fastener 014973192020 Coarse Nylon Insert Lock Nuts, 1/4-20, Piece-100 Diameter: 1/4" Material: Stainless Steel Driver Type: 7/16" Wrench Thread Type: 20 (Coarse) Style: Waxed Nylon Insert Diameter: 1/4" Material: Stainless Steel Driver Type: 7/16 Wrench Thread Type: 20 (Coarse) Style: Waxed Nylon Insert