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✔ Meets/exceeds: DIN 912, ISO 4762 ✔ Screw head style : socket cap; screw drive style: hex socket, known as internal hex, hex size: 4.0mm ✔ Thread Pitch: 0.8 mm, Thread Diameter: 5 mm, Head Diameter : 8.75 mm, Head Height: 5 mm, Thread Length: 45 mm ✔ Easy to store: these screws and hex key come in an easy-use storage box [ Sizes ]------[Thread Length]------[Total Length] M5 x 45 mm-------45 mm-------------50 mm Package Contains: M5 x 45 mm----25 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 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 or socket. They are fastened with an Allen ,which is also called a hex or hex key