StarTech Hex Head M3 Optical Drive Mounting PC Screws - 15 Pack SCREWM3H15 Keep handy M3 threaded screws commonly used to fasten optical drives, and motherboards to the computer chassis Hex Head M3 Optical Drive Mounting PC Screws 15 Pack The Startech.com SCREWM3H15 is the right solution for mounting any optical drives to your PC chassis. This pack of 15 M3 mounting screws are handy for replacing or adding optical drives to your computer systems.