Includes RAM^(R) Pin-Lock(TM) security knobs/keys for double socket arms and gimbal brackets to offer the ideal amount of leverage to properly tighten your mount to prevent slippage in high vibration environments. This low-profile system utilizes various stud sizes to accommodate the most popular GPS, fishfinder and VHF radio brands. Pair this security kit with your RAM^(R) mounting system and feel at ease when leaving your expensive electronics in public places. Made of high-strength composite. Description Diameter B Ball 1"