Double Lens: These loupes come with two different magnification levels, 3.5x each and 7x when combined, allowing for use in a range of applications. EASY TO USE: Magnetic Mount makes it easy and simple to clip the loupes onto your side shields of your safety glasses for hands-free magnification. LIGHTWEIGHT DESIGN: These loupes are designed to be lightweight and comfortable to wear for extended periods of time APPLICATIONS: These loupes are perfect for a variety of applications, including jewelry repair, watchmaking, electronics repair, toolmaking, crafts, and more. MOUNTING COMPATIBILITY: Mounting surface on side of glasses must have a 1/2” high x 3/4” long flat or slightly curved smooth surface. Optical Grade Glass Lenses are 3.5x each when combined 7X, Magnetic mounting double eye loupe, with flexible mounting base to mount on curvature of safety eyewear shields. Mount on left or right side. Adjustable angle for the lens alignment to face of safety eyewear