Check the listing for details. RAM Mount Double 1" Ball Socket Arm with Pin-Lock Security Knob RAM-B-201-SU. Condition: New. Listed at 22.99 USD. Manufacturer DescriptionRAM Double Socket Arm with Pin-Lock™ Security Knob and Key Knob for 1" Balls The RAM-B-201-SU consists of a 1" dia. ball compatible STANDARD LENGTH double socket arm, mixed combination Pin-Lock™ security nut and key knob. RAM® Pin-Lock™ security solutions are designed to withstand the harshest environments where RAM® Mounts are commonly used. With an emphasis on aesthetics and function, RAM® security nuts/knobs are low profile and only add 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.FeaturesMaterial: Power Coated Marine Grade AluminumBall Size: 1" Rubber Ball SizeNote: The "U" in the part number reflects product packaged in poly bag.Weight: 0.30 lbs.