Product Review

✔These screws meet/exceed: DIN 912
✔Material of nuts: 8.8 grade alloy steel
✔Material of screws: 12.9 grade alloy steel, minimum tensile strength : 176,900 psi
✔Surface Finish: black oxide finish with anti-rust oil
✔Easy to store: these screws and nuts come in an easy-use storage case

Item---Thread Length---Total Length
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 18------18mm-------21mm
M3 x 20------20mm-------23mm
M3 x 22------22mm-------25mm
M3 x 25------25mm-------30mm
M3 x 30------30mm-------35mm

Package Contains:
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 22-------25 Pcs
M3 x 25-------25 Pcs
M3 x 30-------25 Pcs

M3 Nuts------150 Pcs
Total: 550 Pcs

About Hex Socket Drives:
 Hex socket hex 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