ToolUSA Triple Spectacle Clip On Loupes, 1" Lenses With 3x, 6x, And 9x Power, Attach To Your Glasses: MG-17281 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