ICC's vented single-sided rack shelf bottom supports up to 50 lbs. capacity and provides air flow to ventilate mounted equipment. Package includes #12-24 mounting screws.Features: Designed with durable steel construction, black powder coated. Supports up to 50 lbs. load capacity Provides air flow to ventilate mounted equipment. Designed to fit standard 19" rack. Available in 2 and 3 rack mount spaces (RMS). Used with all distribution and cable management racks.