Product Detail Standard: 19-inch EIA (Electronic Industries Association) Best used with a 12x10 or less MotherBoard Drive Bracket: Ext 5.25" x 3 + Ext 3.5" x 1 + Int 3.5" x 5 HDD Trays Lockable front door to secure networking environment Dimensions: 7" H x 19" W x 20" D . The "Maxtop 4U IPC-4037B Rackmount Chassis IPC-4032 Short Version" is best product for you. We recommended Maxtop 4U IPC-4037B Rackmount Chassis IPC-4032 Short Version