High quality carbon steel.It has a good maneuverability and high tenacity up to a temperature of about 800 degrees. They have rust resistance and excellent oxidation resistance in poor environment such as high temperature, cold weather, and high moisture areas, which can guarantee a long time using. Different screw sizes: M2 * 8, M2 * 12, M2 * 16, M2 * 20, M3 * 8, M3 * 12, M3 * 16, M3 * 20, M4 * 8, M4 * 12, M4 * 16, M4 * 20, M5 * 8, M5 * 12, M5 * 16, M5 * 20, to meet the different needs. It is a very essential manual tool for the family. With the nuts and washers M2, M3 and M4, the installations are now more precise with an increase in the contact surface, which reduces the Pressure and protects parts and screws. The nuts and washers are arranged in a storage box, which allows you to easily find yourself in the series and avoid the loss when needed. They are anti-oxidizable and corrosive even at high temperature. The main use of the stainless steel hex screw is very frequent electronics, for electrical appliances, chemicals, water, machines and equipment, furniture and many other areas Screw size: m2 * 8 m2 * 12 m2 * 16 m2 * 20 M3 * 8 m3 * 12 m3 * 16 m3 * 20 M4 * 8 m4 * 12 m4 * 16 m4 * 20 M5 * 8 m5 * 12 m5 * 16 m5 * 20 m2 Washer M2 nut m3 washer M3 nut m4 washer m4 nut m5 Washer M5 nut Professional assortment and sizes to meet all your needs, which will bring a work environment more Easy and more convenient. High quality carbon steel. It has good maneuverability and high toughness up to a temperature of about 800 degrees. Anti rust Corrosion resistance No pollution Product quality Premium material High hardness Accessories M2 Allen key hexagonal - Diameter: 1,5mm long UEUR: 16 * 45mm M3 Wrench Allen Hexagonal - Diameter: 2.5mm Length: 19 * 55mm M4 Wrench Allen Hexagonal - Diameter: 3.0mm Length: 23 * 57mm M5 Wrench Allen Hexagonal - Diameter: 3.5mm Length: 26 * 60mm CAUTION: Products contain small pieces. Please do not let children play to avoid accidental ingestion.