Feature: 1. GREAT REFLECTION: This survey prism is designed for excellent reflection, largely improving the measurement imaging and accuracy. 2. OPTICAL GLASS: This prism uses optical glass, which enhances reflection ability, with full texture, clear and bright, making the measurement more accurate. 3. WIDE APPLICATION: Total station prism can be installed in tunnels, roads, bridges, dams, buildings or some other fixed places or objects to measure distortion and displacement. 4. LONG LASTING: The total station prism is made of ABS material, which is sturdy and firm, not easily be damaged, ensuring long lasting use. 5. EASY INSTALLATION: Comes with a compact size and a light weight as well, the prism reflector is very convenient to install within minutes. Specification: Item Type: Mini Peanut Prism Replacement Model: AY03 Material: Optical Glass, ABS Glass Surface Diameter: Approx. 35mm / 1.5in Application: Tunnel, subway, mine, highway and other detection. Package List: 1 x Mini Peanut Prism Replacement1 x Cover