Fits 19 Standard Equipment. Accommodates tower units, and other equipment. Cold Rolled Steel Made. Powder coated finish that protects them from rust and corrosion. Slotted venting. Each rack shelf contains a ventilation hole pattern that is designed to maximize airflow. Light weight and durable, premium quality craftsmanship, yet heavy duty up to 60LB weight capacity. Included 8 X M6 Screws ,8 X Cage nuts and 8 X Washers.