Features： 1、[Multi Adjustment Knobs] Optometry optician frame contains multiple knobs, which can be adjusted for interpupillary distance, nose pads, temples, etc. 2、[PD Adjustment Range] PD 48~80mm adjustment range for both eyes of the trial frame; left and right PD24~40mm adjustment range; minimum graduation value: 1mm. 3、[360 Degree Rotation] The lens of the optical trial frame rotates 360 Degree around the optical axes in frame, with high quality professional design and more flexible use. 4、[Lightweight] Weight of the optometry frame is very light, the net weight of the product is about 75g/2.6oz, and it will not feel heavy when wearing. 5、[Multi Application] Optometry frame is widely used, suitable for visual inspection in optical shops, hospitals, ophthalmology, schools, factories and mines, etc. 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: 120 Degree~0 Degree~135 Degree Right Indexing Plate: 45 Degree~180 Degree~60 Degree The degree of rotation of the lens around the optical axes in frame: 360 Degree Adjustable Range of Nose Pads: Length: Approx. 0-14mm / 0-0.55in; Angle: 0 Degree ~ 30 Degree 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