✔Meets/exceeds: DIN 7991
✔Screw head Style: Flat head, known as countersunk head, countersunk angle: 90 degree
✔Screw Drive Style: internal hex drives, known as hex socket drives, hex Size: 2.0 mm
✔Head Diameter: 5.9 mm; Thread Pitch: 0.5 mm; Thread Dia. : 3 mm, Head Height 1.7mm
✔M3 x 4 means : Metric screws, Thread diameter size 3 mm, Total length 4 mm

[ Sizes ]---[ Thread Length ]----Total Length
M3 x 4-------2.3mm---------4mm
M3 x 5------3.3mm---------4mm
M3 x 6------4.3mm---------6mm
M3 x 8------6.3mm---------8mm
M3 x 10----8.3mm--------10mm
M3 x 12-----10.3mm-------12mm
M3 x 14-----12.3mm-------14mm
M3 x 16-----14.3mm-------16mm
M3 x 18-----16.3mm-------18mm
M3 x 20-----18.3mm-------20mm
M3 x 25-----23.3mm-------25mm
M3 x 30-----28.3mm-------30mm

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----25 Pcs
M3 x 14----25 Pcs
M3 x 16----25 Pcs
M3 x 18----25 Pcs
M3 x 20----25 Pcs
M3 x 25----25 Pcs
M3 x 30----25 Pcs
M3 Nuts----425 Pcs
Hex Key ----1 Pcs
Total: 851 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 Flat Head 】
Flat head screws are designed to fit flush to the surface when used with countersunk holes