Description: These nylon inserted lock nuts can be used anywhere this size is needed. Nylon insert lock nuts are also known as stop nuts, and these nuts are used for fastening to a bolt when mechanically joining materials together. The bolt threads into the nylon material are located at the top of the nut. Nylon insert could prevent backing off or loosening from vibration. Features: These lock nuts are made from 304 stainless steel for durability and great corrosion resistance for outside use. Nylon insert lock nuts have a undersized nylon washer that creates friction with the mating threads to prevent loosening. There are total 9 different sizes of lock nut that you can choose for different bolts and use them in various situation. They can prevent vibration from loosening a bolted joint, resist loosening under vibrations and torque to provide a locking action. These lock nuts are amazing replacement for normal nuts of hardware, vehicles, home or outside applications. Specifications: Material: 304 stainless steel Insert: Nylon M2 100pcs M2.5 100pcs M3 100pcs M4 100pcs M5 100pcs M6 100pcs M8 20pcs M10 20pcs M12 20pcs Package Includes: 1 set x Lock Nuts