Brand: StarTech.com. MPN: SCREWTHUMB. This 50 pack of computer thumb screws is great to have on hand, eliminating the need to use a screwdriver to close up your computer case. The computer thumb screws offer duplicate convenience in the event you need tore-open the computer case, as the thumb screws can be removed by hand without a screw driver. Each of the included #6-32 thumb screws measures 5/16". Advantage Thumb screw design allows for easy, tool-less removal ideal for computer case panels. Applications For tool-less removal of PC case cover.