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✔ These screws meet/exceed: DIN 912 ✔ Screw Head Style: Socket Cap; Screw Drive Style: Internal Hex, known as Hex-socket Drives ✔ Material of Screws: Carbon Steel, Black Oxide Finish, DIN912-12.9 Grade, Minimum Tensile Strength : 176,900 psi ✔ Easy to store: 100 Pcs screws come in an easy-use separated girds storage case ***Specification*** ----Item-------------------Head Dia.---------Head Height---------Thread Length-------Total Length M3 x 16mm------------------5.5mm/0.22"-------3mm/0.12"-------------16mm-------------19mm M3 x 20mm------------------5.5mm/0.22"-------3mm/0.12"-------------20mm-------------23mm M3 x 25mm------------------5.5mm/0.22"-------3mm/0.12"-------------25mm-------------28mm M3 x 30mm------------------5.5mm/0.22"-------3mm/0.12"-------------30mm-------------33mm M3 x 35mm------------------5.5mm/0.22"-------3mm/0.12"-------------35mm-------------38mm ***Package Quantity*** M3 x 16mm------------------20 Pcs M3 x 20mm------------------20 Pcs M3 x 25mm------------------20 Pcs M3 x 30mm------------------20 Pcs M3 x 35mm------------------20 Pcs ***About Internal Hex Drive*** Internal hex drives, also known as hex-socket drives, are similar to hex drives, but 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 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.