iexcell 100 Pcs M3 x 20/25/30/35/40 Alloy Steel 12.9 Grade Hex Socket Head Cap Screws Bolts Assortment Kit, Black Oxide Finish;

✔ Meets/Exceeds: DIN 912
✔ Fully Threaded
✔ 12.9 grade alloy steel, hardness: HRC 39-44, tensile strength: 1220N/mm²
✔ Surface Finish: black oxide finish with anti-rust oil
✔ Easy to store: these screws come in an easy-use storage case

Item---------------Thread Length------------Total Length
M3 x20mm-----------20mm---------------------23mm
M3 x25mm-----------25mm---------------------28mm
M3 x30mm-----------30mm---------------------33mm
M3 x35mm-----------35mm---------------------38mm
M3 x40mm-----------40mm---------------------43mm

Package Contains:
M3 x20mm-----------20Pcs
M3 x25mm-----------20Pcs
M3 x30mm-----------20Pcs
M3 x35mm-----------20Pcs
M3 x40mm-----------20Pcs
Total: 100 Pcs

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
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