Nylon insert stop and lock nuts are ideal to securely fasten a bolt when connecting materials. This Zinc-Plated Nylon Insert Lock Nuts Kit contains the following nylon insert lock nut variants: #6-32 (qty 15), #8-32 (qty 15), #10-24 (qty 15), #10-32 (qty 15), 1/4"-20 (qty 15), 1/4"-28 (qty 15), 5/16"-18 (qty 12), 5/16"-24 (qty 12), 3/8"-16 (qty 10), 3/8"-24 (qty 10), 7/16"-14 (qty 8), 7/16"-20 (qty 8), 1/2"-13 (qty 6), 1/2"-20 (qty 6).