Abstract: Security apparatus is provided for preventing theft or portable electrical and other equipment having connections for radio frequency cable or other types of cable thereon. The apparatus includes a substantially uncuttable flexible tubular member for receiving a cable therein. First and second elongated housing sleeves are mounted on opposed ends of the flexible tubular member for connection to the equipment and a separate base unit or a fixture. Each housing sleeve has a pair of parallel passages, a first of which receives the flexible tubular member therein and a second of which receives specially actuable rotatably operable locking means. According to this invention, a planar lip surrounding the first passage in each housing sleeve is retained in tightly abutted engagement with the equipment or the base unit or fixture as applicable so that no space is available for prying or tampering with the cable connections which are completely enclosed in the housing sleeves.