Available in Heavy Duty or Economy Models.Standard Heights Available: 7, 76, 8, 10Standard Widths Available: 19, 23All side rails are drilled and tapped on both sides.All Relay Racks are shipped with all necessary assembly hardware.Full compliant with Token Ring requirements and USA (EIA), European (IEC) standards.Variations in hold patterns, other dimensions and finishes available upon request. Four Post Relay RacksFour Post Relay RacksRelay Rack AccessoriesRelay Rack Accessories