Procraft 10U desktop 19" equipment rack system. Rails extend upward at a gentle slope (10 degrees). Kit includes: One pair 11U Penn Elcom pre-tapped rack rail(for 10-32 machine screws). The bottom rack space is used for unit assembly, only the top 10 spaces are available for rack mounting. Press-in rubber bumpers or the unit can be secured with screws. Lock nuts for the press-in studs. Free set of 12 rack screws and washers included! Overall dimensions are 19-7/16" wide x 19-1/4" tall x 11-1/2" deep. Assembly is required.