Offset/Constant: +23.1mm, accuracy: +/-2mm, Compatible with Leica Robotic Total Station 5 arcsec beam deviation Swiss Type snap on connector to 5/8"-11 Female Thread adapter, Stainless Steel, 60mm/2.36" Height The prism have 5/8" x11 male thread on the top , Swiss type joint ( Dia.12mm) on the bottom Product Description 360 Degree Surveying Reflective Prism Reflector GRZ122 Replacement Compatible with Leica Robotic ATR Total Station Offset/Constant: +23.1mm accuracy: +/-2mm, 5 arcsec beam deviation Compatible with Leica Robotic Total Station Optional: Swiss Type snap on connector to 5/8"-11 Female Thread adapter, Stainless Steel, 60mm/2.36" Height