The trial frame has the ability to accommodate up to four pair of lensesEasier to use and easier to wear changeable cylinder axisFully adjustable temple length and nose restHorizontal and vertical bridge adjustment new optical trial lens frame, provides the ability to refract even the most difficult prescriptions and offers all the adjustments to a proper and comfortable fit onto your patient.The trial frame has the ability to accommodate up to four pair of lensesSeparate PD adjustment for each eyeIndividual adjustments for temple lengthAdjustment for rotating cylindersScales with numeralsMaterial: metal or plasticLens holder with a diameter of 38mmWide Range of PD Adjustments: 48 - 80mmPackage Content:1xtrial frameNote:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.