Feature:1. Excellent Performance: Premium GPH1 prism assembly features copper coated prisms for consistent results.2. Assembly: Equipped with a 34mm offset prism and an 86mm HT, this prism is able to perform best work. Take it with confidence!3. Adjustable: Equipped with a brass connector, you can make adjustments according to your own needs.4. Protective Case: Equipped with a protective case, the prism can be well defended and ensure a long life span.5. Scope of Application: This prism is compatible with for GPR1, GPH1. Remember to check the model before buying.Specification:Item Type: PrismMaterial: ABS, K9, BrassEffective Diameter: Approx. 65mm/2.6inPrism Constant: 0mm (for Total Station, the Prism Constant is 0mm)Connector Type Diameter: Approx. 12mm/0.5in HoleScope of Application: Suitable for GPR1, GPH1.Package List:1 xPrism