This item is provided by Crutchfield.com and includes free phone technical support for the life of the product. Details on how to take advantage of this service will be included with your package. Should you have any issues locating information on how to contact Crutchfield Technical Support, please contact this website's Customer Service department. The shelf fits in your Sanus component rack, and is 3-1/2" high. The shelf's durable powder-coated finish resists scratches. Ventilation slots help keep air moving and your component cool. Cable openings in the back provide access points for you to run and secure your wire. What's in the Box: 1. Black vented rack-mount shelf (2U height) 2. 18" Hook-and-loop strap (2 pieces) 3. Plastic shelf stop