✔ Meets/Exceeds: DIN 912, DIN934, DIN125
✔ Screw head style: socket cap; screws drive system: Internal Hex drives, known as hex socket drives, hex size: 2.5 mm
✔ Screw head diameter: 5.5 mm; screws head height: 3 mm; thread pitch: 0.5 mm; thread diameter: 3mm

[Sizes]---[Thread Length]---[Total Length]
M3 x 4------4mm-----7mm
M3 x 5------5mm-----8mm
M3 x 6------6mm-----9mm
M3 x 8------8mm----11mm
M3 x 10----10mm----13mm
M3 x 12----12mm----15mm
M3 x 14----14mm----17mm
M3 x 16----16mm----19mm
M3 x 20----20mm----23mm
M3 x 25----25mm----28mm
M3 x 30----30mm----33mm

Package Contains:
M3 x 4----50 Pcs
M3 x 5----50 Pcs
M3 x 6----50 Pcs
M3 x 8----50 Pcs
M3 x 10---50 Pcs
M3 x 12---50 Pcs
M3 x 14---50 Pcs
M3 x 16---25 Pcs
M3 x 20---25 Pcs
M3 x 25---25 Pcs
M3 x 30---25 Pcs
M3 Nuts---450 Pcs
Φ3 Washers--450 Pcs
Hex Key------1 Pcs
Total: 1351 Pcs

[ About Internal Hex drives ]
Internal Hex drives, also known as Hex Socket 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