Hex nuts - with nyloc nylon insert - fine thread - high tensile They are backed by a 90-day limited factory warranty. Several other popular sizes are also available and are sold separately They are sold in a set of 10 pieces and are perfect for use around the shop or race track. Allstar Hex Nuts 10pcs 3/8"-24 Hex Nut, Nylon Insert, Zinc Plated Steel, Fine Thread Fine Thread Hex Nut Description Fine Thread Hex Nut With Nylon Insert, 5/8in. -18 Emissions WarningProducts sold on this website may not be legal for use on public roads or highways due to Environmental Protection Agency (EPA) restrictions or California Air Resources Board (CARB) emissions regulations. Federal and State regulations may restrict Product installation to pre-emissions regulation (Model Year 1974 or... Sold in a set of 10 pieces Allstar Fine Thread Hex Nut with Nylon Insert (Pack of 10) have a nylon insert and are 5/8-18 threads. HEX NUTS-SELF LOCKING-NYLON INSERT-STAINLESS STEEL-M6 x 1.00mm-316/A4 It has a 90 day limited warranty