Feature:1. K9 Glass: The prisms are made of K9 high end glass components, ensuring not only accurate position but also high durability.2. Surface Polishing: The optical glass lenses of the prism are carefully polished and the uniform and fine coating of the surface guarantees the quality of the lenses.3. ABS Protective Case: The prism is fitted with an ABS protective case to ensure that the glass prism section is protected from wear and tear, extending its life.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: This prism is suitable for inspection of tunnels, subways, mines, roads, etc. and is suitable for measuring instruments such as for Trimble.Specification:Item Type: Single Tilt PrismMaterial: K9 glass, ABSEffective Diameter: Approx. 64mm / 2.5inConstant: 0mm/-30mmScope of Application: Inspection of tunnels, subways, mines, roads, etc. Applicable to measuring instruments such as for Trimble, for TOPCON, for NIKON, for Sokkia, for Pentax.Use: Widely used in many industries such as underground, railway, tunnel, dam, steep slope, etc..Package List:1 x Single Tilt Prism1 x Cover1 x Storage Bag