Made of high quality carbon steel. Stainless steel is a common material with a density of 7.93 g/cm3, also called 18/8. It is characterized by good machinability and high toughness up to a temperature of about 800 degrees. Various sizes of thread screws: M2.5*3, M2.5*4, M3*3, M3*4 ,M3*10, M4*4, M4*6, M4*8, M5*5, M5*8, M5*10, M6*6, M6*10, M8*8, M8*12, 20 pieces each, order to meet different requirements. It is a very important manual tool for the family Threaded screws are arranged in a storage box, which makes it easier for you to find the series and avoid loss if necessary. Hexagon socket head Design, can be easily driven with Allen keys and not easy to slip, also has a thin edge that could dig into the contact surface for a secure grip on a variety of surfaces. Application: Suitable for door handles, Faucets, lights, knobs, faucet repairs, plumbing and other small repairs around the shop, garage or home. DimensionQuantity M2.5*3- --20 pieces M2 .5 * 4 ---- 20 pieces M3*3-----20