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✔ Meets/Exceeds: DIN 912, ISO 4762 ✔ Material of Screws: Stainless steel 304 , high strength and anti-corrosion in various environments ✔ Material of Hex Key: chrome-vanadium steel, nickel plated ✔ The screws come in an easy-use separated girds storage box Sizes--Thread Length--Total Length M2 x 4-------4mm------6mm M2 x 6-------6mm------8mm M2 x 8-------8mm------10mm M2 x 10-----10mm-----12mm M2 x 12-----12mm-----14mm Package Contains: M2 x 4-------50 Pcs M2 x 6-------50 Pcs M2 x 8-------50 Pcs M2 x 10------50 Pcs M2 x 12------50 Pcs Hex Key----1 Pcs Total: 251 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, 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