The RAP-S-KNOB5-GU includes Pin-Lock™ security knobs/keys for 1.5" dia. double socket arms and Gimbal brackets. The RAP-S-KNOB5-GU 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-KNOB5-GU 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. The included Pin-Lock™ security knob for Gimbal brackets is a universal design that utilizes various stud sizes to accommodate most popular GPS, chart plotter, fish finder and VHF radio brands. With a simplistic design, our security knob is extremely affordable and simple to install. Pair this with a security knob for your RAM® mount and you can feel at ease when leaving your expensive electronics in public places without the concern of theft or tampering.