RAM Pin-Lock™ Security Knob w/ 6-Pin Pattern for B Size Socket ArmsThe RAP S KNOB3 6U consists of a 1 4" 20 female threaded security knob and key knob. The RAP S KNOB3 6U replaces all knobs on 1" diameter B size arms and mounts. The RAP S KNOB3 6U offers the ideal amount of leverage to properly tighten your mount to prevent slippage in heavy chop or in extreme vibration environments. With an emphasis on aesthetics and function, the RAP S KNOB3 6U is low in profile and only adds a small amount of additional bulk to