This is a nice kit for the home or workplace because it contains an assortment of sizes of screws. A variety of sizes to suit your needs and they come in a handy reusable p-lastic c-ontainer so that it is convenient for you to take everywhere. What are you waiting for? Just come and buy. Specifications: Material: Stainless steel Item quantity: 440pcs M 38 20pcs M 312 20pcs M 316 20pcs M 320 20pcs M 48 20pcs M 412 20pcs M 416 20pcs M 420 20pcs M58 15pcs M512 15pcs M516 15pcs M520 15pcs Nut of M 3 80pcs Nut of M 4 80pcs Nut of M5 60pcs Package size: 178 * 105 * 23mm/ 7* 4.1 * 0.9inches(Length * Width * Height) Package weight: 531g/ 18.7ounces Packing list: 1 Box * Screws