RAM® Horizontal 6" Swing Arm Mount with Ball & Socket Rectangular Plate RAM-101-B-247-4 Those round plates have a

Those round plates have a 3 hole 120 degree pattern that connects to the RAM Tough-Dock™

Track Ball™ base and 2" x 4" rectangular plate

Universal 3 inch double socket arm mount with a square base and a round base

5" diameter round plate with universal AMPS hole pattern

the additional peace of mind and tamper resistance comes at a very affordable price

RAM® Horizontal 6" Swing Arm Mount with Ball & Socket Rectangular Plate RAM-101-B-247-4 Those round plates have aThe RAM single swing and socket arm mount includes a 6" straight swing arm mounted on a horizontal surface mounting base. At the end of the mount is a rectangular 6. 25" x 2" top base. The pivoting point of the rectangle base allows 180 degree rotation, the swing arm allows a 360 degree rotation.