Made of 304 stainless steel for durability and corrosion resistance. Internal thread hexagonal lock design provides secure fastening. Available sizes include 1/8', 1/4', 3/8', 1/2', 3/4', 1', 11/4', 11/2', 2', 3', 4'. Ideal for nut fittings, providing reliable connections. Pack of 2 pieces of 1/4' size. Benefits and features at a glance - Corrosion resistant 304 stainless steel for long service life in varied environments - Internal thread hexagonal lock design ensures secure, stable fastening - Wide size range covers common nut fittings and assemblies - Reliable connections in mechanical, plumbing, and equipment installations - Ready to use in pairs with the 1/4' size included Practical use scenarios - Plumbing and hose fittings on residential or commercial projects requiring durable stainless steel fasteners - General machinery assembly or equipment builds where multiple nut sizes are needed for secure joints - Outdoor or moisture-exposed equipment installations where corrosion resistance is important This description preserves the original specifications and functions while presenting clear, benefit-focused information for customers.