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✔Meets/Exceeds: DIN 912, DIN934 ✔Screw head style: socket cap; screw drive system: hex socket, also known as internal hex drives, hex size: 2.5 mm ✔Head diameter: 5.5 mm; head height: 3 mm; thread pitch: 0.5 mm; thread diameter: 3 mm ✔ M3 x 20mm means : Metric screws, Thread diameter size 3 mm, Thread length 20 mm [ Sizes ]-----[ Thread Length ]------[ Total Length ] M3 x 20mm-----20mm/0.79"----------23mm/0.91" M3 x 25mm-----25mm/0.98"----------28mm/1.10" M3 x 30mm-----30mm/1.18"----------33mm/1.30" M3 x 35mm-----35mm/1.38"----------38mm/1.50" M3 x 40mm-----40mm/1.57"----------43mm/1.69" Package Contains: M3 x 20mm-------20 Pcs M3 x 25mm-------20 Pcs M3 x 30mm-------20 Pcs M3 x 35mm-------20 Pcs M3 x 40mm-------20 Pcs Hex Key Wrench---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