3X 4X 5X 10X Eye Magnifier Jeweler Loupe Set 5 Pcs 5 New Eye Loupes. This is a new set of 5 eye loupes. These are great for viewing stamps, coins and gems. Each lens diameter measures approximately 7/8" (22 mm). You receive: One 2 1/2x loupe with a focal distance of 3" (76 mm). One 3x loupe with a focal distance of 3" (76 mm). One 4x loupe with a focal distance of 2 1/2" (63 mm). One 5x loupe with a focal distance of 2" (51 mm). One 10x loupe with a focal distance of 1" (25 mm).