Nylon Round Washer Assortment Kit, For M2 M2.5 M3 M4 M5 M6 M8 screw/bilt-Black Nylon washer assortment kit, packed in a plastic box, 7 sizes each 50 pieces, total 350 pieces. Suitable for metric M2, M2.5, M3, M4, M5, M6, M8 screws/bolts. Material: Nylon 66. Fire rating: 94V-2. Operating temperature: -20 ~ 120C.