NEW Tri-Guard PillarsTri Guard Security Pillars 8. 2 MHz Frequency System Product Description: The Tri Guard Security Pillars provide superior protection for a 6 foot wide doorway entrance. This modern 8. 2 MHz frequency security system is designed to detect both hard plastic anti theft tags and disposable sticker labels, making it an ideal solution for double door entrances. The system is optimized for detecting smaller labels and tags, providing enhanced security for