Top Security full-enclosure solution for schools and gymnasiums! Use the Projector Guard Security Cage? to save unnecessary costs and hassles caused by projector theft. A top security solution for schools and universities, the PG series fully encloses projectors in a locked steel cage to prevent theft, as well as recreational damage. Easy to install using standard 1.5" NPS pipe Security cage requires attachement bracket depending upon your projector type (RPA-U recommended). Ceiling bracket and extension pipes also available separately. Will accommodate projectors up to 16" W x 7.5" H x 16" D.