Specification: Item Type: Optometry Frame Material: Alloy Frame Inner Diameter: Approx. 32.5mm/1.2in Color: Black + Silver Pupil Distance (Abbreviated PD) Adjustment Range: Eye PD: Approx. 48-80mm / 1.89-3.15in; Left and Right PD: Approx. 24-40mm / 0.94-1.57in; Minimum Graduation Value: Approx. 1mm/0.04in Axial Indexing of the Dial: Left Indexing Disc: 1200135 Right Indexing Plate: 4518060 The degree of rotation of the lens around the optical axes in frame: 360 Adjustable Range of Nose Pads: Length: Approx. 0-14mm / 0-0.55in; Angle: 0 30 Left and Right Frame Leg Length Adjustment Range: Approx. 98-135mm / 3.86-5.31in (Data May Have A Little Error) Package List: 1 x Optometry Frame Note: Manual measurement, please allow some errors.