BelOMO 10x Triplet Loupe Folding Magnifier with attached plain black nylon lanyard with quick release buckle Large 0.65'' (17mm) Viewing Area 10x Power Achromatic Triplet Lens for Bright, Clear and Color Correct View 3/4 Inch Wide Neck Plain Black Nylon Lanyard with Quick Release Buckle. Lanyard installed by removing a screw, sliding lanyard over shaft, and replacing screw, Great for rocks, minerals, jewelery, coins, stamps, part inspection