Leica GRZ4 style 360 Degree Prism ReflectorModel NO.: ADS360-1Leica GRZ4 Style. Six copper coated prisms mounted in an plastic frame, Leica Style Tip Adapter on bottom. For mass point surveys, 3D profiles, solo operation, networking. Permits measurements without alignment of the instrument. Rubber sealed caps for optimum protection of prisms. Offset is +23.1mm. Survey prism for remote control and tracking applications.