The Tool-less Shelf provides a support surface for equipment mounted within a 19in rack. It mounts onto rack angles that have EIA-spaced square holes (.375 inch). The shelf slides open and provides a variable-sized, continuous surface for equipment. The back of the shelf has oval cutouts for power and data cables. The shelf also features accessory hole patterns at the back of the shelf that fit small and large D-rings to help manage cable. It is rated for 150 lb. (68 kg) static load. NOTE: FOR SQUARE-HOLE RACK ANGLES ONLY!