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✔ Meets/Exceeds: DIN912 ✔ 12.9 alloy steel, hardness: HRC 39-44, tensile strength 1220 N/mm² ✔ Rust proof : black oxide finish, covered with anti-rust oil ✔ These screws adn a hex key come in an easy-use separated girds storage box [ Sizes ] ---------[ Thread Length ] --------Total Length M5 x 60mm-----------60mm--------------65 mm M5 x 65mm-----------65mm--------------70 mm M5 x 70mm-----------70mm--------------75 mm M5 x 75mm-----------75mm--------------80 mm M5 x 80mm-----------80mm--------------85 mm Package Contains: M5 x 60mm------------5 Pcs M5 x 65mm------------5 Pcs M5 x 70mm------------5 Pcs M5 x 75mm------------5 Pcs M5 x 80mm------------5 Pcs Hex Key -----1 Pcs Total : 26 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 screws, also known as Allen head screws, 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