These are the magnifying glasses that are worn like eyeglasses, providing 2 3/4X magnification while keeping hands free. Ideal for examining the finer details of stamps and coins, tying flies, or simply threading a needle, the coated achromatic lenses reduce aberrations by bringing both purple and blue light wavelengths into focus in the same plane, resulting in clear images. Each lenspiece may be individually focused by turning each barrel to ±3 diopters, and they accommodate interpupillary and nose bridge adjustment. Optimized to focus on objects with a focal range of 39", the objective lenses are made from durable borosilicate that resists scratches. Plastic temples with aluminum bridge. Folds to 2 3/4" H x 2" W x 6 1/4" L for storage in included carrying case. Spectacles 2 1/2 oz.; with case 4 3/4 oz.