Wide Application: Casaon Self Tapping Screws Assortment are mainly used in metal, wood, or plastic. These screws commonly have a sharp point that helps penetrate the material. | Material & Workmanship: Casaon screws are made from high quality 304 stainless steel known for its dependable and rigid strength as well as its corrosion resistant quality. The screw thread is very sharp and sturdy, and won't easily strip with the screw gun. | Customized Set: More practical customized assortment. It includes 285pcs flat head and 285pcs round head, both of them contains M3/M4/M5/M6 x 12mm/20mm/25mm/40mm/50mm screws, meet all your demands, a must for your home life. | Storage Box: There are 570 pcs different types of screws. All of screws will be packed in a sturdy convenient case, can be used for a storage box, is organized to you. | Quality Service: If you are not 100% satisfied for any reason, we will take it back and offer a replacement or refund the full purchase price if necessary. No hassles, no delays, and no questions asked!