Version Coin - 50 Pack - Computer Case Screws M3 X 4mm Pan Washer Head with Phillip's Screwdriver Head Screws for Computer Motherboard, Hard Drives, Optical Drive Mounting Bag of 50 Screws Pan Head with Phillip's Head Screwdriver Slots M3 (0.5 Threading) 4mm Screw Commonly used for fastening case sides. Can be used to mount motherboards, hard drives, power supplies, etc. that use M3 screw mounts.