Arkon RM2XCMAMPS25 4-Hole AMPS Drill Base Mount with Circular Metal AMPS Drill Base and Head (sku 55953)Circular adapters provide mounting flexibility 4 Hole AMPS base attaches to solid flat surfaces Double adjustment points The RM2XCMAMPS25 4 Hole AMPS drill base mount is part of Arkons Robust Mount Series. It features a metal AMPS drill mount base as well as a metal AMPS head for extra stability for commercial vehicle use. This mount measures approximately 7. 25 inches high from end to end, and the mount shaft arm is made of metal. The mounts circular