Features: Degree of lens rotating around optical axis in the lens frame:360. Easier to use and easier to wear Easily changeable cylinder axis. Offers all the adjustments to ensure a proper and comfortable fit onto your patient. Axial graduation increases along the lens frame axis counter clockwise. Suitable for eyesight examination in spectacles shops, department of ophthalmology in hospitals, schools and enterprises. Specifications: Material: Metal Axis rotation: 360 degrees. Pupil distance range: 48mm-80mm; Step: 1mm Mirror ring diameter: 38mm Lens number: 8 lens Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Optical Trial Frame