RAM B 201U RAM Double Socket Arm for B Size Mounts AU Mounts RAM A 201U B :: RAM Long Double Socket Arm For 0.56" Balls :: Express RAM Pin Lock Double Socket Arm (RAM B 201 SU) (sku 55021) RAM Double Socket Arm with RAM Pin Lock Security Knob C Size Short RAM B 201 201U C Double Socket Arm and Ball Adapter Mounts AU. Standard RAM double socket arm provides an ideal overall length of 3. 73" and a socket to socket length of 3"; includes mixed combination RAM Pin Lock security nut and key knob Attaches to any B size RAM ball component, including mounting bases and device holders; double ball and socket technology allows for near infinite adjustability of your RAM mounting system Made of powder coated, marine grade aluminum for durability and reliability in the most demanding environments 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. HARDWARE INCLUDED (1) RAM Pin Lock Security Key PRODUCT DIMENSIONS Overall Length: 3. 73" SOCKET TO SOCKET LENGTH 3"