StarTech M3 x 1/4-Inches Long Screws - 15 Pack 15SCREWM3 Keep handy M3 threaded screws commonly used to fasten optical drives, and motherboards to the computer chassis M3 x 1/4" Long Screws - 15 Pack This pack of 15 M3 x 1/4" long screws are handy for building, repairing, and maintaining computer systems.