The RAM® Double Socket Arm with RAM® Pin-Lock™ Security Knob consists of a composite C size double socket arm and mixed combination Pin-Lock™ security nut and key knob for theft deterrence. RAM® Pin-Lock™ security solutions are designed to withstand the harshest environments where RAM® Mounts are commonly used. With an emphasis on aesthetics and function, RAM® security nuts/knobs are low profile and only add a small amount of additional bulk to your system when compared to the standard knob included.