This set of bolt screw cover is made of quality PE material, not easy to break, long-lasting, promising long-time durability. Help protecting screws from rusting outside, water, dust, etc., help to prolong screws’ service lifespan and help to decorate your furniture as well. 6 sizes of bolt cover/screw cap available, width ranges from 7mm to 18mm: 50pcs M47, 30pcs M58, 20pcs M610, 10pcs M813, 20pcs M1017, 15pcs M1219, which can fulfills your various unexpected needs. Comes with a plastics storage box, you can find the corresponding size easily, can prevents the nut cover and other little stuffs from missing, easy storage and transportation. Specifications: Name: Bolt Cover Material: PE+plastics Color: white, black (optional) Item size: M4: 7 * 4.5 * 8.5mm / 0.28 * 0.18 * 0.33in M5: 8 * 5.5 * 9.5mm / 0.31 * 0.22 * 0.37in M6: 10 * 8.5 * 14mm / 0.39 * 0.33 * 0.55in M8: 13 * 9.5 * 16mm / 0.51 * 0.37 * 0.63in M10: 17 * 10.5 * 20mm / 0.67 * 0.41 * 0.79in M12: 19 * 12 * 21.5mm / 0.75 *