Antique Octagonal Glass retailer Doorknob Set

Octagonal glass doorknob set. One knob has a brass base, and the other knob has a steel base. They are connected together on a split spindle that unscrews from the center. Both knobs are attached to the spindles and cannot be removed. The knobs measure retailer 2-1/4 inches in diameter. They project 2 inches from the base. The spindle measures 2-1/2 inches when the knobs are fully connected together.