The bracket was described in the patent letter as having a collar to prevent capillary action of water and the interior parts were coated with non-conductive materials. Some threadless varieties have also been mentioned but are unverified at this time. As can be seen by the center specimen, weather and time were not kind to this insulator. It is difficult to find specimens in the near mint condition of the piece on the right. Most such undamaged specimens came from within buildings such as railroad depots.
Some specimens have the patent date on the metal cap.
These pieces are quite rare and are even more difficult to find intact.