Quadrex Head Motherboard Screws in packs of 50 to be used for PC computer cases motherboards PCI cards etc.These screws are made of iron material.Motherboard Screws.These are used on many parts including LCD, palmrest and motherboard.Short Motherboard Screws are commonly used on laptop, and these are very short and thin screws compare to other screws.Made of high-quality metal, with high strength and no deformation.Self-drilling screws can be widely used in machinery industry, office appliances, home decoration and other furniture repairs.