Arkon RMS2XCMAMPS 4-Inch Heavy-Duty 4-Hole AMPS Mount (sku 59204)4 Hole AMPS drilled base mount provides double ball swivel Compatible with holders, cradles, and devices having a 4 Hole AMPS pattern Circular metal 4 Hole AMPS adapters provide stability for drilling into solid, flat surfaces RMS2XCMAMPSB is a composite 4 Hole AMPS Mount thats part of Arkons Robust Mount Series. The mount includes a composite Robust shaft arm, with circular metal 4 Hole AMPS adapters connected to either end to create a versatile,