This Gator 12U Rack Rail Set is great for anyone looking to organize their equipment in a rack. It's suitable for use in various setups like offices, data centers, or recording studios. The exterior dimensions are Length: 21', Width: 0.6', Height: 1.5' and it weighs 1 lb. It comes with 2 rack rails per package, has a 3mm thick black powder-coated finish, and rack unit numbers printed on the rails for easy identification.