Metric Stainless Steel Assorted Machine Screw Set With Allen Hex Socket Head And Various Size: Includes M3 M4 M5 M6 8mm 12mm 16mm 20mm bolts Assortment. Quantity: Contains 660 pcs 24 sizes of the most commonly used nuts bolts washers to meet different needs. Material: Made of high quality 304 Stainless Steel, good performance of rust and corrosion oxidation resistance, ensure long time using even in bad environment. Workmanship Package: The thread is very sharp and sturdy, not easily strip with screw gun, and be packed in a sturdy convenient case, can be use for a storage box organized to you. Wide Application: Widely used in bicycle, furniture, car license plate, automobile, electrical connections on the power source of household and commercial appliances, and other places of indoor or outdoor.