GRZ4S 360 Degree Prism with Tribrach, High Quality Copper Coated Metal 360 Degree Reflective Prism for Leica Total Station Survey Item contains. Corner Cube Prism 6. ·5 arcsec beam deviation. · +23.1mm offset / constant. Metal Prism Holder 2. · Lifting the Prism Height by 79mm. · Dual Tube Bubble Level.