This magnifier has a unique design. It is equipped with 3 separate, 1", 3x power magnifiers, each is attached to a clip that attaches to you eyeglass frame, and you can select 1, 2, or all 3 lenses to assist you in viewing items up close in great detail. You can select from 3x, 6x, or 9x magnification. When not needed, you simply push the lenses up, and out of the way. Each lens is equipped with it's own tension screw, to make sure the lenses stay where you put them. * These glass lenssz are 1 inch in diameter, and has Each has 3.3X power magnification Lenses are equipped with a spring loaded clip to attach to your reading glasses The clip can be worn on either side of your glasses, and the lenses swivel out of the way Choose from 3x, 6x or 9x power by combining lenses Great for jewelers, watch makers, print shop, science lab and more