6Pcs 10X Eye Loupe 3X Key Chain Folding Magnifier Tool 3 Folding Key Chain Magnifiers 3X. This is a new set of three 3X folding key chain magnifiers. Handy and easy to carry. All have a 3 1/2" (89 mm) focal distance. Each lens measures approximately 27 mm in diameter. Each measures approximately 2" x 1 7/16" (51 x 37 mm) closed and about 3 1/2" x 1 7/16" (89 x 37 mm) open. Color received may vary per piece, per order from photo. Three 10X Round Loupes. This is a new set of three 10X round loupe. Great for viewing stamps, coins, beads and gems. May help reduce eye strain. The swing away cases protects the lenses. The viewing lenses measures approximately 16 mm (5/8") in diameter. Each has a 1" (25.5 mm) focal distance. We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.