The RAP-S-KNOB-VB-109U includes Pin-Lock™ security knobs/keys for single swing arms found on RAM vehicle mounting kits. The RAP-S-KNOB-VB-109U 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-KNOB-VB-109U is low in profile and only adds a small amount of additional bulk to your system when compared to the standard knob included. At a fraction of the cost of currently available keyed locking knobs, the additional peace of mind and tamper resistance comes at a very affordable price.