BERGEON 2611-N-3.5 Magnifying glass for watchmaker in black synthetic material no 3.5, 2.8 xMade of synthetic material. For efficient work, the strength (magnification) of the eyeglass must be adapted to each individual job. A reliable magnification should be used for ordinary work, this avoids eyestrain ! Eyeglasses with a high degree of magnification are to be used for limited periods only. As you will see, our eyeglasses are available different strengths; you can thus choose the one that suits you best. As these glasses are inexpensive, we would advise you to keep a set giving different degrees of magnification.PLEASE NOTE THAT ALL tools are READY TO SHIP, We ship to all countries worldwide by DHL, international shipping takes from 3 to 7 days, and domestic shipping takes 3 days.