HP JC665-61001 - HP X421 A-Series Ch Unvl Rck Mntg Kit

X421 chassis universal rack mounting kit - For 4-post racks where the mounting depth is between 500mm (19.69in) and 800mm (31.50in) - Includes cage nuts, screws, and a pair of slide rails - Can hold up to 350kg (771.6lb)