[Package details:]
M4x40mm 10pcs
M4*35mm 10pcs
M4x30mm 10pcs
M4x25mm 10pcs
M4x20mm 10pcs
M4 Hex Nuts 50pcs
M4 Lock Nuts 50pcs
[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.