Magnetic Monitoring Prism Mount adapter strong magnetic rail shoe 1.Magnetic Monitoring Prism Mount/Base/ Tribrach Accurate aluminium and high grade steel construction, compact construction surveying used holding M Prisms. Prism Holders. Retro targets Scanner Spheres, etc 2. Equipped with 3 strong Magnetic Bars(Ndfeb) 1pcs dia 10*40mm and 2pcs dia 10*25mm securely embedded into L-shape Alloy Aluminum construction project surveying like railway subway, bridges, etc 3. height to the Centrecircular prism 125mm 4. Installed w . Leica-style Adapter ADP8-12ST M8 male Thread to Da12+0. 02 Leica-style Stubspigot compatible with all Leica-style Prisms, Prism Holde and Retro Targets suc GHP1 GHP3 GHP1P GRP113 GRZ4 GRZ12 MPR122 etc 5 . Coming w on-board Circular Bubble CB-4040 / 2mm adjustable Circular Vial for quick aligning and positioning 6 . Customization service available Features 1 . Magnetic Rail Shoe ( Monitoring Prism Mount ) 2 . w . Leica-style Spigot ( Dia 12mm ) 3 . w Circular Vial ( 40 / 2mm ) 4 . W Triple Magnetic Bars Ndfeb 5 . For Railway Surveying ( Reflector Prisms)