GC - 3pc Jewelry Eye Loupe Set 10x 30x + 10x&20x Dual Magnifying Loupe Magnifier Glass Lens Chrome Plated Body US FAST FREE SHIPPER The 3pc jewelers loupes set includes one 10X 21mm chrome loupe, one 30X 21mm chrome loupe and one 10X&20X dual butterfly loupe. etal body with glass lens The 10X power loupe has a focal distance of 1" (26mm), the lens size is 21 mm diameter; The dual butterfly loupe has 10X power lens with 18 millimeters and 20X power lens with 12 millimeters, the strong magnifications with a mid distance of 1/2" (13 mm) as well. The 30X power loupe has a focal distance of 1/2" (13 mm). The lens size is 21 mm diameter, it also include a small loop to attach to a neck chain or key chain. They are all made of optical glass and protected when not in use by the swing-out chrome plated metal cover, it's perfect for pawn shops, antique stores and jewelry shops. All three loupes come in an individual protective plastic case.