Features Optical Glass Lens: This corner cone prism is made of optical glass lens, which is carefully polished, and the even and fine coating on the surface can guarantee the quality of the lens. Silver Coated Film: This corner cone prism is coated with silver film, which makes the lens uniform and delicate and protects the lens. Accurate Measurement: This corner cone prism is brightly textured to provide accurate measurements and work efficiency. Compact And Lightweight: This corner cone prism is small in size and light in weight, which makes it very easy to install and replace the operation. Wide Application: This corner cone prism is widely used in many industries such as subway, railroad, tunnel, dam, steep slope and so on. 1. Optical Glass Lens: This corner cone prism is made of optical glass lens, which is carefully polished, and the even and fine coating on the surface can guarantee the quality of the lens. 2. Silver Coated Film: This corner cone prism is coated with silver film, which makes the lens uniform and delicate and protects the lens. 3. Accurate Measurement: This corner cone prism is brightly textured to provide accurate measurements and work efficiency. 4. Compact And Lightweight: This corner cone prism is small in size and light in weight, which makes it very easy to install and replace the operation. 5. Wide Application: This corner cone prism is widely used in many industries such as subway, railroad, tunnel, dam, steep slope and so on. Specification: Item Type: Corner Cone Prism Material: Excellent Optical Glass Aperture: 0.2-1 Aperture Irregularity: 0.2-0.5 Brightness: 60/40 Comprehensive Angle: 3s-8s Package List: 1 xCorner Cone Prism Package List 1 x Corner Cone Prism