Hoffman E4DR19FM45U Open 4 Post Rack, 19"x45RU, Alum/Black4-Post Open Frame Racks combine the mounting security of a cabinet with the accessibility of a rack. Used in communication data center and telecommunication room applications, these adjustable-depth racks support deeper, heavier network equipment and can be ganged with standard 2-post or other 4-post racks to expand existing systems.Features:Uprights on the tapped-hole model are made of lightweight extruded aluminum (6063-T6 alloy) and include RU markings on both front and back of uprightsUprights on the square-hole model are made from 12 gauge steelTop and bottom angles made of extruded aluminum (6063-T6 alloy) Product Specifications BRANDHoffman® MANUFACTURERS PART NUMBERE4DR19FM45U CONSTRUCTIONAlum NOMINAL FRAME HEIGHT A7 ft. MOUNTING HOLE TYPETapped DESCRIPTION4-Post Open Frame Rack COLORBlack A X B INCHES83.88x20.25in A X B X C MM-- A X B X C INCHES-- SIZE A X B INCHES83.88 x 20.25 A X B MM2131x514mm SIZE A X B MM2131 x 514 RACK UNITS45