Peerless-AV ACC-CCP Cathedral Ceiling Adapter for Projectors & Flat Panel DisplaysThe 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 from an angled ceiling. This adaptor offers +95 5 of adjustment and includes a security slot for theft resistance. The ACC CCP is a low profile, secure solution to support nearly any projector or display in an angled ceiling application. +95 5 of adjustment Compatible with 1. 5" 11. 5