Lock nuts are hex nuts with a nylon insert. This design minimizes vibration, corrosion, and helps to prevent loosening. The flat side of the lock nut should sit flush with the material once tightened. Used to connect both metal and wood components Made from zinc plated steel for durability Use a 9/16 in. socket or wrench to tighten Includes 10 pieces to complete your project Zinc plating Standard threading Nylon insert