The StarTech.com PCSCREWKIT is a handy assortment of common PC fasteners for building, repairing, and maintaining computer systems. The kit includes 12 different fasteners all in a plastic carrying case with divided compartments. Includes 50 screws in each of 7 category types for a total of 350 screws as well as an assortment of standoffs. Screws included: SCREW6 32, SCREW6 32 3, SCREWM3, SCREW4 40, FANSCREW; Standoffs included (StarTech part number): SCREWNUTM, SCREWNUT4 40, STANDOFF, STANDOFF2, STANDOFF3; Nuts included: NUT4 40 2, NUT4 40 6.