[Content:]
M3 x 30mm --- 20Pcs
M3 x 25mm --- 20Pcs
M3 x 20mm --- 20Pcs
M3 x 18mm --- 40Pcs
M3 x 16mm --- 40Pcs
M3 x 12mm --- 40Pcs
M3 x 10mm --- 40Pcs
M3 x 6mm --- 40Pcs
M3 x8mm --- 40Pcs
220pcs --- M3 Hex Nuts

[About Countersunk Screws:]
The countersunk screws are mostly used in places where the surface of the parts cannot be raised after installation.
The parts to be fastened are thick and thin. The so-called thick, that is, the thickness of the parts to be fastened is larger than the head of the countersunk head screw.
Thickness, after the screw is tightened, a part of the screw thread does not enter the threaded hole.