These cage nuts are made of carbon steel, which is one of the forms of metals, making it last longer than other nuts on the market These cage nuts greatly reduce loosening under vibrations and torque. for both indoor and outdoor use corrosion resistance to regular steel. Features - Color: Black. - Size: 1.60X1.10X1.10cm/0.63X0.43X0.43 inch. - Material: Carbon steel. - Compared with locking washer, it has better performance because it is made of non-corrosive material. - Have strong anti-rotation ability, which can prevent the cage nut from weakening and loosening under vibration and torque, thus reducing the clamping strength. - The transparency of the box allows users to check the quantity and inventory without opening the box. - Square cage nut designed for racks and cabinets with square holes, Mounting your standard rack mountable equipment into a server rack or cabinet. - Made of carbon steel, construction, not easy to rust. Package list: nuts screws