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✔Meets/Exceeds: DIN 912, DIN934 ✔Material of Screws, Nuts and Washers: Stainless Steel 304, High Strength And Anti-corrosion in Various Conditions ✔Material of Hex Key: Chrome-Vanadium Steel, Nickel Plated, Higher Strength And Anti-rust ✔All you need in one box: includes screws, nuts, washers and 1 pcs hex key ✔Screw head style: socket cap; screw drive system: hex socket, also known as internal hex drives, hex size: 2.5 mm ✔Head diameter: 5.5 mm; head height: 3 mm; thread pitch: 0.5 mm; thread diameter: 3 mm ✔M3 x 30mm means metric screws, thread diameter size 3 mm, thread length 30mm [ Sizes ]--------[ Thread Length ]----[ Total Length ] M3 x 30mm------30mm/1.18"-------33mm/1.30" M3 x 35mm------35mm/1.38"-------38mm/1.50" M3 x 40mm------40mm/1.57"-------43mm/1.69" M3 x 45mm------45mm/1.77"-------48mm/1.89" M3 x 50mm------50mm/1.97"-------53mm/2.09" Package Contains: M3 x 30mm------20 Pcs M3 x 35mm------20 Pcs M3 x 40mm------20 Pcs M3 x 45mm------20 Pcs M3 x 50mm------20 Pcs M3 Nuts---------100 Pcs M3 Washers-----100 Pcs Hex Key ---------1 Pcs Total: 301 Pcs About Hex Socket Drives: Hex Socket drives, also known as Internal Hex drives, have a hexagonal hole in the center that requires an Allen key, also known as a hex key or Allen wrench About Socket Cap Head: Socket Cap Head , also known as Allen head , have a recessed drive, and are commonly used when there is not enough clearance for a conventional wrench or socket. They are fastened with an Allen wrench, which is also called a hex wrench or hex key