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The RAM-VB-109-1U is a double swing arm for RAM vehicle mounts. 

RAM-VB-109-1U shown above.

RAM-VB-109-1U Features:

• Warranty: Manufacturer's, RAM Mounts (National Products Inc.), Limited Life Time Warranty.
• Size: RAM C sized 1.5 inch socket with 1.5 inch diameter rubber ball.
• Description: The (RAM-VB-109-1U), double swing arm for the RAM Vehicle Mounts, includes two 6" long arms with a tele-pole connection hole at one end and a 1.5 inch diameter ball with 2.5 inch diameter plate. The two swing arms connect with a bolt and knob system. With a simple turn of the knob you can pivot the swing arms at this center point and the tighten the knob to lock the arms in place.
• Swing Arm Dimensions: The swing arm is 12 inches when fully extended.