It is iron with enough strength. The screw is resistant and durable.
The short screw is a M5 flat for head self tapping chassis fan general screw, which can be used in the general position of the chassis.
Long screw size length 30mm, fixed interface 3.4mm. Short screw size M5, 8mm length.
Mainly used in PC, computer monitors, fans and other equipment products.
Long screws are screws in special positions of the chassis, such as small screw holes in the fan position of the power bin the front panel of the chassis, screw holes for fixing the fan on the water-cooled cold exhaust. These screws do not contain