Sold as 1 Each. The V-shaped base adds and supports up to 30 inch monitors at 33 lbs. Large sized V-shaped base. The V-shaped base adds and supports up to 30 inch monitors at 33 lbs. Max Screen Size 30 inch. VESA 75x75 and 100x11. Supported by manufacturer's limited lifetime warranty. Tilts up or down 30 degrees. Steel construction. Height adjustable 13.4 inch. Rotate 360 degrees (portrait or landscape).