<br>Item Type: Optometry Frame <br>Material: Aluminium Alloy <br>Color: As shown in the picture <br>Range of PD Adjustments: PD of Both Eyes: 50-80mm / 2.0-3.1in, Left or Right PD: 25-40mm / 1.0-1.6in, Minimum Calibration Value: 1mm. <br>Axial Calibration on Each Disc: Left Disc: 140°-0°-130°, Right Disc: 50°-180°-40°, Axial calibration increases counter clockwise along the lens frame axes, and the calibration distance is 5°. <br>Inner Diameter of Lens Frame: Φ32.5mm / 1.3in. <br>The Number of Lens Which Can be Inserted Into Left or Right Lens Frame Simultaneously: 4 PCS <br>Degree of Lens Rotating Around Optical in the Lens Frame: 360°<br>1、Suitable for students or&nbsp; professional use. <br>2、Made of high quality material, durable and has a long service life . <br>3、 Precise workmanship, humanized design, adjustable height of nose holder, more comfortable to wear. <br>4、 Lightweight and comfortable for your patient. <br>5、 Large capacity, the left or right frame can hold 4 lenses at the same time.1. Because there was a manual measuring ,the size may has 1-2inch difference. <br>2. The color may be slight different due to the condition or light or different monitor.<div>1 x Optometry Frame</div><div>1 x Instruction Manual</div>