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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 come in an easy-use separated girds storage box [ Sizes ] --------------[ Thread Length ] --------Total Length M6 x 35mm----------35mm/1.38"--------------41mm/1.61" M6 x 40mm----------40mm/1.57"--------------46mm/1.81" M6 x 45mm----------45mm/1.77"--------------51mm/2.01" M6 x 50mm----------50mm/1.97"--------------56mm/2.22" M6 x 55mm----------55mm/2.17"--------------61mm/2.42" Package Contains: M6 x 35mm------------4 Pcs M6 x 40mm------------4 Pcs M6 x 45mm------------4 Pcs M6 x 50mm------------4 Pcs M6 x 55mm------------4 Pcs Total : 20 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