APCMAMPS57Arkon Robust Round Aluminum 57mm (2.25 inch) Ball to 4-Hole AMPS Adapter

The APCMAMPS57 round metal 57mm ball to 4-hole AMPS adapter suits 57mm (2.25 inch) mounts and pedestals, including Arkon and RAM Mounts Size D options. (Mounts, holders and devices sold separately.) Its all-metal build makes for a solid, dependable join when drilling into a dashboard or another firm, flat surface, which is why it works so well in commercial vehicles and fleet fit-outs. The circular footprint is a handy option for spots and devices where a square adapter simply won't fit.