_x000D_ 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. _x000D_ _x000D_ _x000D_ Features: _x000D_ These lock nuts are made from 304 stainless steel for durability and great corrosion resistance for outside use._x000D_ _x000D_ Nylon insert lock nuts have a undersized nylon washer that creates friction with the mating threads to prevent loosening. _x000D_ There are total 7 different sizes of lock nut that you can choose for different bolts and use them in various situation. _x000D_ They can prevent vibration from loosening a bolted joint, resist loosening under vibrations and torque to provide a locking action. _x000D_ _x000D_ These lock nuts are amazing replacement for normal nuts of hardware, vehicles, home or outside applications._x000D_ _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Material: 304 stainless steel _x000D_ Standard: A2-70_x000D_ _x000D_ Insert: Nylon _x000D_ _x000D_ Size & Quantity: _x000D_ M3 45pcs _x000D_ M4 35pcs _x000D_ M5 30pcs _x000D_ M6 25pcs _x000D_ M8 15pcs _x000D_ M10 10pcs _x000D_ M12 5pcs _x000D_ Box Size: 17.4 x 10 x 2.3cm / 6.85 x 3.94 x 0.91"_x000D_ _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ 1 set x Lock Nuts