Feature 1[360 Degree] There are six individual prisms connected together, allowing the measurement beam to be reflected from any angle. 2[High Accuracy] The coating on the prism makes the measurement more accurate, and the copper or silver coating enhances the reflectivity of the prism. 3[Excellent Material] 360 prism is accurate inspection of optical glass, and the prism material is carefully polished by K9 excellent glass cutting, which makes the measurement more accurate and durable. 4[Land Surveying Instrument] This all metal component can be used with a total station for land surveying and has a wide variety of uses. 5[Scope of Application] The prism head is suitable for the inspection of tunnels, subways, mines, highways and other measuring instruments for railroads and dams.SpecificationItem Type: 360 Degree Reflective PrismMaterial: K9, ABSConstant: +23.1mmEffective Diameter: Approx. 25.4mm / 1inScope of Application: Tunnel, subway, mine, highway and other testing, applicable for Trimble and other measuring instruments.Use: Widely used in many industries such as subway, railroad, tunnel, dam, steep slope, etc. Package List1 x 360 Degree Reflective Prism1 x Storage Bag