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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: 2.5mm ✔ Thread Diameter: 3 mm/0.12", Head Diameter: 5.5 mm/0.22", Head Height: 3 mm ✔ Easy to store: these screws and hex key come in an easy-use separated girds storage box Sizes--------------Thread Length------Total Length M3 x 20mm-----------20 mm-------------23 mm Package Contains: M3 x 20mm----100 Pcs Hex Key --------1 Pcs Total---101 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