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✔ Meets/exceeds: DIN 7991 ✔ Screw Head: flat head, known as countersunk head, countersunk angle: 90 degree ; screw drive: hex socket , known as internal hex drives ✔ Material of Screws : stainless steel 304, high strength and anti-corrosion in various environments ✔ Material of Hex Key Wrench: chrome-vanadium steel, nickel plated ✔ Easy to store: These screws come in an easy-use separated girds storage case Item-------------Thread Length-------Total Length M3 x 6mm ----------3.8mm-------------6mm M3 x 8mm ----------5.8mm-------------8mm M3 x 10mm ---------7.8mm------------10mm M3 x 12mm ---------9.8mm------------12mm M3 x 16mm---------13.8mm------------16mm Package Contains: M3 x 6mm--------50 Pcs M3 x 8mm--------50 Pcs M3 x 10mm-------50 Pcs M3 x 12mm-------50 Pcs M3 x 16mm-------50 Pcs Hex Key Wrench--1Pcs Total: 250 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 Flat Head Flat head screws are designed to fit flush to the surface when used with countersunk holes.