The upper one ring design makes it easy to hold and open, not easy to slip off. The optics loupes magnifier with 30X magnification can provide you more clear and close view for tiny objects. Perfect tool for watch making or repair, viewing jewelry, coins, stamps, houseplants, rock collection, horticulture and so on. Made by a special magnifying dedicated optical glass material. Lightweight and tiny, great to have one in your pocket all the for time. Just hold the optics loupes magnifier in your hand and make it close to the object then you will see the enlarged effect. If keep your eye close and parallel to the magnifier, you can see the object clear. Features: The upper one ring design makes it easy to hold and open, not easy to slip off. The optics loupes magnifier with 30X magnification can provide you more clear and close view for tiny objects. Perfect tool for watch making or repair, viewing jewelry, coins, stamps, houseplants, rock collection, horticulture and so on. Made by a special magnifying dedicated optical glass material. Lightweight and tiny, great to have one in your pocket all the for time. Specifications: Material: Zinc Alloy + Optics Lens Magnification: 30X Lens diameter: 1.57inch / 40mm Size: 1.57x1.18inch / 40x30mm Color: Black Package includes: 1 x 30X Optics Loupes Magnifier