OptiVISOR Flex-a-Mag Magnifier 4X Power Hands Free Desktop Magnifier The OptiVisor Flex-a-Mag desk magnifier is designed for stability and ease of use. This base is very sturdy and the 12 inch "goose neck" style flexible arm allows a wide choice of angles. The powerful 4X lens is made of light weight optical grade Acrylic selected for the optimum field of view and focal length. The base is 6-1/2" wide x 6" deep and the overall height when extended is 17-1/2". Why do I need this item? The Flex-a-Mag desk magnifier will keep your "hands free" and allow you to work longer without eye strain when making jewelery, beading or just reading. Not just for Jewelry Making. Lens diameter is 4"