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✔ Meets/exceeds: DIN 912 ✔ Material of Screws: 12.9 grade alloy steel, hardness: HRC 39-44, tensile strength: 1220N/mm² ✔Surface Finish of Screws: black oxide finish with anti-rust oil ✔Material of Hex Key : chrome-vanadium steel, nickel plated ✔Easy to store: these screws and hex key come in an easy-use storage case Sizes----------Thread Length------Total Length M5 x25mm-------25mm-------------30mm M5 x30mm-------30mm-------------35mm M5 x35mm-------35mm-------------40mm M5 x40mm-------40mm-------------45mm M5 x45mm-------45mm-------------50mm Package Contains: M5 x25mm------5 Pcs M5 x30mm------5 Pcs M5 x35mm------5 Pcs M5 x40mm------5 Pcs M5 x45mm------5 Pcs Hex Key---------1 Pcs Total: 26 Pcs About Hex Socket Drives: Hex socket hex 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