These lock nuts are made of stainless steel, which is one of the forms of metals, making it last longer than other nuts on the market With a nylon insert, these lock nuts greatly reduce loosening under vibrations and torque. for both indoor and outdoor use corrosion resistance to regular steel. Feature - Color: Silver. - Material: Stainless Steel. - Size: 1.90X1.90X1.20cm/0.75X0.75X0.47 inch. - These lock nut manufactured with industrial strength, which can replace locking washers, prevent bolts from being exposed and provide better safety and firm fixation. - 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 locking nut from weakening and loosening under vibration and torque, thus reducing the clamping strength. - Advanced stainless steel nylon locking nut, 7 common sizes, general, convenient, easy to use, professionals and DIY users. - The rugged plastic box serves as a suitcase, allowing users to organize locking nuts in a neat manner according to size. It can also be stored in a garage, workbench or as a convenient storage space. The transparency of the box allows users to check the quantity and inventory without opening the box. Package list: 185 x nuts