Features: With double side, a great repair glasses tools. Made of high quality PVC, durable & long for time service. One side of frame adjustment plate used to adjust the frame, the other is used for external opening angle measurement. One side of lens test card is used for lens diameter test, the other is used for progressive lens test. With double side, an excellent eyeglasses tools. Specifications: Material: PVC Size: approx 30x22cm/11.8x8.7in Style: Glasses Frame Measurer/Glasses Diameter Measurer(optional) 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 Glasses Test Card