The M3.0 x 4.0mm Hardened Carbon Steel Screw is made from hardened carbon steel and is black in color. The thread type is an M3.0 and has a thread length of 4.0mm. These are commonly used for optical drives and motherboard mounting.
The M3.0 x 5.0mm Hardened Carbon Steel Screw is made from hardened carbon steel and is black in color. The thread type is an M3.0 and has a thread length of 5.0mm. These are commonly used for optical drives and motherboard mounting.
The M3.0 x 5.0mm Hardened Carbon Steel Screw is made from hardened carbon steel and is black in color. The thread type is an M3.0 and has a thread length of 5.0mm. These can be used to mount side panels on compatible cases, Lian Li for example.