The RAM Double Socket Arm D Size Medium (RAM-D-201U) provides standard-length connection for large marine electronics. This medium-length arm features dual sockets accommodating 57mm D-size ball bases with 21.4cm overall length and 17.5cm socket-to-socket measurement. The single spring mechanism opens both end sockets for ball insertion and pivot adjustment.The marine-grade powder-coated aluminium construction delivers durability in demanding marine environments. Compatible with any D-size RAM ball components including mounting bases and device holders. Weight capacity of 1.2kg.RAM-D-201U – Medium D-Size Double Socket Arm 21.4cm Overall Length – Standard reach with 17.5cm socket-to-socket spacing 57mm D-Size Sockets – Accommodates 2.25-inch ball bases both ends Near-Infinite Adjustment – Ball and socket technology for precise positioning 1.2kg Weight Capacity – Marine-grade aluminium construction