Description- The set includes four 30x 21mm chrome loupes and four 10x&20x dual loupes The 30x power loupe has a focal distance of 1/2" (13mm) with 21mm dia lens size The dual loupe is 10x power with 18mm lens size and 20x power with 12mm lens size, the strong magnifications with a mid distance of 1/2" (13mm) Made of optical glass lens with chrome plated metal body; protected when not in use by the swing-out chrome plated metal cover Both loupes come in a protective plastic case Chrome plated metal body with glass lens It include a small loop to attach to a neck chain or key chain Good for identifying small marks on jewelry, watch making industry, specially for inspectingBrand new