Built by Crain for their prism poles and rover rods but fits any 5/8×11 poles Point w/ Tip assembly SECO / Crain #  91605 3.37 inch (85.6 mm) aluminum prism pole point with steel tip Weighs 0.01 lb (0.004 kg)   Topo Boot   SECO / Crain #  91601 The TopoBoot® screws over the precision point and increases the area of the point for the use on soft surfaces in topo shots The Topo-Boot is removable and stores conveniently under the large, easy-to read vial Weighs 0.05 lb (0.02 kg)