The Cathedral Ceiling Adaptor can be used with 1.5"-11.5 NPT extension columns (EXT,AEC models only) to securely mount and support a projector or flat panel display froman angled ceiling. This adaptor offers 95°/-5° of adjustment and includes a securityslot for theft resistance. The ACC-CCP is a low-profile, secure solution to supportnearly any projector or display in an angled ceiling application.