Odyssey FZGS1304 Flight Zone Glide Style Ata Combo Rack: 13u Top Slant, 4u Vertical "Carpeted sliding laptop platform mounted above a 19"" ATA case Slanted rack with 13 spaces Vertical rack with 4 spaces" Slanted rack with 13 spaces Vertical rack with 4 spaces Slide it forward to use your laptop. Height From Top Slanted Rail to Interior Bottom: Front is 12.5inches and Back is 16inches Slide it back to use the mixer section underneath