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✔ Meets/Exceeds: DIN912 ✔ Stainless steel 304, high strength and anti-corrosion in various environments ✔ Screw Head Style: socket cap; screw drive style: hex socket, known as internal hex drives ✔ These screws come in an easy-use separated girds storage box Item---------------Thread Length-----------Total Length M5 x 20mm-----------20mm/0.79"----------25mm/0.98" M5 x 25mm-----------25mm/0.98"----------30mm/1.18" M5 x 30mm-----------30mm/1.18"----------35mm/1.38" M5 x 35mm-----------35mm/1.38"----------40mm/1.57" M5 x 40mm-----------40mm/1.57"----------45mm/1.77" Package Contains: M5 x20mm--------10 Pcs M5 x25mm--------10 Pcs M5 x30mm--------10 Pcs M5 x35mm--------10 Pcs M5 x40mm--------10 Pcs Total: 50 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 screws Socket cap 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.