5 New Double Lens Folding Magnifiers. This is a new set of 5 double lens folding pocket magnifiers. Both lenses are 10X and you can combine the two for a total of 20X power. The glass lenses used in these folding pocket magnifiers provide durability for a long life. The durable plastic swing-away cases not only provide a protective cover for the lenses, but serve as handles as well. Each 10X lens has a 1" (25 mm) focal distance. When combined for a total of 20X, it has a 1/2" (13 mm) focal distance. Each measures approximately 2 3/16" x 1 1/2" x 1" (56 x 38 x 25 mm) closed and 3 15/16" x 1 1/2" x 1" (100 x 38 x 25 mm) open.