Features Flat Design --- This road prism has a flat design and is mounted on the road without interfering with the passage of the chan bright on the road. 500m Measuring Range --- This road prism has a wide measuring range and is very practical with a range of application up to 500m. Glass Protector --- This highway prism comes with a glass protector that effectively protects the prism from scratches. Wide Application --- This highway prism is very widely used, which is suitable for monitoring the road, subway and so on. Excellent ABS Material --- This highway prism is made of excellent ABS material, which is sturdy and wear resistant, not easy to be eroded, high temperature resistant, and has a long service life. Specification: Item Type: Survey Road Monitoring Prism Material: ABS Measuring Range: Approx. 500m/19.7in Prism Diameter: Approx. 12.7mm/0.5in Package List:1 x Survey Road Monitoring Prism Package List 1 x Survey Road Monitoring Prism