The prism kit features 0 and -17.5 mm offsets.
The white site cones on the X and Y axes help centering instrument crosshairs.
The heavy-duty point can handle the abuse on the bottom of a pole.
The white adapter is used to make the prism height 115 mm for use with most standard prism poles.
Weighs 0.8 lb (0.36 kg), 1.3 lb (0.59 kg) with heavy-duty point.