• The set includes one 30x 21mm chrome loupes and one 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"

• Made of optical glass and protected when not in use by the swing-out chrome plated metal cover

• Both loupes come in a protective plastic case

10X 20X & 30X Jewelers Gemstone Combo Eye Loupes Tools 30X Eye Loupe. This is a new doublet lens loupe made of optical glass with a round swing-away chrome plated case. The shape allows it to rest comfortably in the eye socket. This has become the standard style of loupe used in the watch making industry and is excellent for any application where magnification is needed. In terms of performance, it is second to none. It is 30X power and has a focal distance of 1/2 in. (13 mm). The lens has a 21 mm diameter20X & 10X Eye Loupe. This is a new dual power loupe made of optical glass with a swing-away, chrome plated case. The shape allows it to rest comfortably in the eye socket. This has become the standard style of loupe used in the watch making industry and is excellent for any application where magnification is needed. It is 10X power on one end and 20X power on the other. The 20X has a 12 mm lens and the 10X has a 18 mm lens. The 10X lens has a focal distance of 1 in. (25 mm) and the 20X lens has a focal distance of 1/2 in. (13 mm). These are second over runs from china. This could be 17 or 18 mm or double or triple lens and it may be misprinted. This is a great bargain at an inexpensive price. Please no e-mails with requests because we can make no guarantees.