Feature: 1. 360 Prism Design: Our total station prism is with 360 prism design has 6 individual prisms connected together. 2. Constant and Quick Release Button: Total station prism has standard offset constant +23.1mm and quick release button connections. 3. K9 Glass and Reflection: Total station prism is made of excellent K9 glass and possible to measure the reflection of the beam from any angle. 4. ABS Material Housing: This total station prism is with ABS housing and around the top and bottom of the prism for protecting the glass. To prevent the prism rod from tipping over at the top. 5. Versatile: Total station prism can be used to withstand jobsite environments, ideal for all machine work requiring measuring rods. Specification: Item Type: 360 Universal Total Station Prism Material: K9 Glass, ABS Constant: +23.1mm Effective Diameter: Approx. 25.4mm \/ 1in Application: Tunnel, metro, mine, highway and other testing, applicable for Trimble, for Leica GRZ4 and other measuring instruments. Use: Widely used in metro, railroads, tunnels, dams, steep slopes and many other industries. Package List: 1 x Universal Total Station Prism 1 x Storage Bag