These Serrated Flange Nuts are made from A2 Stainless Steel and conform to DIN6923 standards. The pack sizes available are 100, 200 and 500 units, and the thread sizes range from M4 to M12. The nuts feature an External Hex drive style, making them easy to install and secure. Perfect for various fastening needs in industrial, office and business settings, these high-quality nuts offer durability and reliability in a range of applications.