Features: 130Pcs in 1 Set: There are 30pcs hex socket button head screw in the set, which will satisfy your various working needs. 2Stainless Steel: The utilization of A2 stainless steel brings the screw great hardness and extra durability for long using. 3Coarse Thread: Comes with even and deep coarse thread, the screw ensures firm and stable fixing and not easy to slip. 4Wide Application: ISO9730 standard design enables wide use in varied industries, such as automotive, engineering, etc. 5Easy to Install: Compact size, light weight and even thread make the installation smoother and much more convenient. Item Type: Hex Socket Button Head Screw Material: A2/70 Stainless Steel Standard: ISO7380 Head Diameter: Approx. 18mm / 0.7in Head Height: Approx. 5.5mm / 0.2in Thread Diameter: Approx. 10mm / 0.4in Pitch: Approx. 1.5mm / 0.1in For Hex Wrench Size: Approx. 6mm / 0.2in A2 stainless is commonly referred to as 304 or 18/8 because it contains 18% chromium and 8% nickel. A2 is an austenitic stainless steel and is almost non magnetic but will still stick lightly to a magnet due to the cold working process. A2-70 is the most commonly used grade, the 70 represents a tensile strength of 700N/mm2. A2 is suitable for a wide range of applications in a lot of different industries such as the automotive industry in applications such as body panelling and bumpers etc., the food industry and catering due to its ease of cleaning and corrosion resistance, also commonly used in the engineering industry and architecture, A2 is also favoured by the remote control and model making enthusiasts. Also a favourite for many different DIY jobs in and around the home and garage for those jobs where a standard BZP fastener will not do. In general A2-70 is ideal for a whole range of uses where a good finish is needed on an interior or exterior applications. 30 x M10x55 Screw