Topcon 51910 Single Prism Holder
High impact plastic fixed prism holder for Topcon 51803 single prism (sold separately)
Prism can be mounted on one side for zero offset or in the recessed side for -30mm offset.
Has a 5/8 x 11 female thread in its base for mounting to a prism pole.
Top has a 5/8 x 11 male thread for a candy cane like the Topcon 51828 (sold separately)