Feature 1360 Prism Design: Our total station prism is with 360 prism design has 6 individual prisms connected together. 2Constant and Quick Release Button: Total station prism has standard offset constant +23.1mm and quick release button connections. 3K9 Glass and Reflection: Total station prism is made of excellent K9 glass and possible to measure the reflection of the beam from any angle. 4ABS 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. 5Versatile: Total station prism can be used to withstand jobsite environments, ideal for all machine work requiring measuring rods.SpecificationItem Type: 360 Universal Total Station PrismMaterial: K9 Glass, ABSConstant: +23.1mmEffective Diameter: Approx. 25.4mm / 1inApplication: 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 List1 xUniversalTotalStationPrism1 x Storage Bag