8 different typesContains 8 Sizes of the most commonly used white nylon spacers,100* M2,100* M2.5, 100* M3, 50M4, 50M5, 509M6, 50M8, 20M10 screws/bolts. Nylon flat washer to meet your various needs, easy to install. Nylon flat washers Lightweight, good insulation, will not cause magnetic problems, used for motherboard to prevent electrical short from metal to metal contact. widely used in various fields such as semiconductors, automobiles. Good ProtectionFlat gasket white intended for general use under the head of bolt or nut in order to provide a smooth-bearing surface, increase force area, reduce pressure and wear, protecting parts well. Convenient in Storage520pcs different sizes white Plastic washers are packed in plastic box with size details paper for easy identification, portability and storage. Wide UsablePlastic washer spacer are resistant to changes in temperature, air, water, natural gas, silicone, gasoline, etc. Great for garages, plumbers, workshop, car, door, window, electric appliance, bearing, pump, drain plugs.