Manufacturers / Suppliers Product Library and Links Centra Security Services > About > Our Partners > Manufacturers / Suppliers Product Library and Links The below manufacturers have been carefully selected by Centra as product suppliers to ensure the end user benefits from the best available.. Access Control Management Systems CCTV IP & MegaPixel Cameras DVR & NVR (Digital & Network Video Recorders) Barriers and Turnstiles Control Room Furniture Electric Door Locking Hardware (Magnet Locks and Electric Releases)