Feature: 1. OPTICAL GLASS LENS: The prism of the total station is made of optical glass, featuring neat cuts, and a refined surface for a strong visual appeal. 2. COPPER COATING: The surface is copper coated to ensure durability, with smoothly lines, firm construction, vibrant colors that are resistant to deformation and fading. 3. ENHANCED REFLECTIVITY: The optical glass enhances the prism's reflection capability, providing a full bodied, clear, and bright measurement for more accurate and long lasting results. 4. PRISM CONSTANT: When used with for Leica total stations, the prism constant is set to 0mm. And this surveying prism is suitable for GPR1, GPH1. 5. SUPERIOR CRAFTSMANSHIP: Meticulous attention to detail, excellent workmanship, and accuracy polishing create a prism of exceptional quality and superior performance. Specification: Item Type: Total Station Prism Material: Optical Glass, ABS Prism Constant: 0mm (for Leica total station, prism constant is 0mm) Connector Type Diameter: Approx. 12mm / 0.47in hole Suitable for Leica GPR1, GPH1. Package List: 1 x Total Station Prism1 x Cover