"The RAM-109-1AP is a Bent 6"" long Arm Extension for the RAM 109 series. This arm includes a 3"" long bolt, washers and tightening knob. This swing arm will connect directly to either the RAM-109H-B Horizontal Base or the RAM-109V-B Vertical Base. The 3"" bolt will allow the swing arm to connect to a RAM-109 base, and the other end of this mount will connect to either a second Swing Arm with 4"" Bolt RAM-109-1A or RAM-109-1ATU or a Rectangular Pivoting Plate RAM-111BT"