Features: Horizontal and vertical bridge adjustment Individual PD adjustment for each eye. Individual adjustment of temple length Adjustment of rotating cylinder. Scale with large numbers. Trial frames can hold up to four pairs of lenses. This provides the ability to refract even the most difficult prescriptions. It is very lightweight and offers all the adjustments to ensure a proper and comfortable fit for your patient. Easier to use and easier to wear Legs can be adjusted to the best length you want. Made of high quality materials, durable. Specifications: Material: Metal Color: Silver Black Inner Hole: 32.5mm Maximum Distance Between Left and Right Temples: 200mm Left and Right Temple Length Adjustment Range: 98mm~135mm Nose Adjustment Range: Length: 0 to 14 mm; Angle: 0 to 30 degrees Frame Geometric center position displacement: 0.3mm Non-concentricity between the optical center of the lens and the geometric center of the frame: 0.5mm Non-parallelism between the optical axis of the lens and the geometric axis of the frame: 2.5 degrees The angle that the lens rotates around the optical axis in the frame: 360 degrees Package includes: 1 x Optical Trial Frame Note: Due to differences between different monitors, the pictures may not reflect the actual color of the item. Please allow slight deviation due to manual measurement.