iOptron Center Post For Tri-Pier 360 and Permanent Pier - P-8037-CPiOptron Center Post For Tri Pier 360 and Permanent Pier This iOptron Center Post For Tri Pier 360 and Permanent Pier is required to attach a CEM 60 or an iEQ45 iEQ45 Pro Mount onto a Tri Pier 360 or to a Permanent Pier. Provided as shown, except NOTE: The black plate is shown in a photo to illustrate the attachment and result. The black plate is NOT included.