These economical monitor stands allow for custom height adjustment to within 1 in (2.5cm) for optimal viewing. Each stand interlocks with the piece below. Sizes can be intermixed to reach the desired height. Made of high-impact plastic for durability. Available in 1in and 2in (2.5 and 5.1cm) models. The 11-1/4in (29cm) square base is supports up to 125 lbs. (57kg). For added convenience, the 2in (5.1cm) model has a built-in storage area to help reduce desktop clutter. Vu Ryser 3 measures 16 3/4" x 15 1/2" x 2" and is also Ideal for printers, fax machines, and other office machines up to 80 lb. Each unit is sold individually. Patented.