These high quality m6 x 12mm screws and cage nuts make it easy to mount equipment in your server rack or cabinet m6 rack screws m6 cage nuts m6 screws m6 mounting screws 50 pack of m6 screws and cage nuts for server rack and cabinet all black steel construction square cage nut designed for racks and cabinets with square holes mounting your standard rack mountable equipment into a server rack or cabinet guaranteed reliability with a lifetime warranty