Designed to hold a Spherically Mounted Retro-Reflector or other Spherical Type Targets on centerline of a threaded hole representing the centerline of the pitch diameter of the treads 1.0000″ or 25mm above and allows for the SMR to be rotated below horizontal all the way around, in an unimpeded fashion.

An optional sealed cap is offered to protect the nest from debris. Laser engraving available on cap.