Description These Lock Nuts are 304 Stainless Steel which is one of the highest forms of corrosion resistant metals, making it last longer than other Nuts on the market today. With a nylon insert, these lock nuts greatly reduce loosening under vibrations and torque. Rated for both indoor and outdoor use Superior corrosion resistance to regular steel. Features - Color: As shown.- Material: Stainless Steel- Size: 0.55x0.55x0.39cm- These Lock Nuts are 304 Stainless Steel which is one of the highest forms of corrosion resistant metals, making it last longer than other Nuts on the market today.- With a nylon insert, these lock nuts greatly reduce loosening under vibrations and torque- Our hex lock nuts are very strong and are great for both indoor and outdoor use. This stainless is superior to regular steel and provides excellent rust resistance.- Clamp screw hex nuts are great to have around for use in wood and wet environments. Clamp Screw Hex Nuts are the highest quality available on the market.- Rated for both indoor and outdoor use Superior corrosion resistance to regular steel.- Warm Tip: Dear buyer, Due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you!Packing list: 100 x lock nuts