The 25mm ball to 4-Hole AMPS circular metal adapter is compatible with 25mm (1 inch) mounts and pedestals. (Mounts, holders, and devices sold separately.) The adapter's metal construction provides a sturdy connection for drilling into dashboards or other solid, flat surfaces, ideal for commercial or fleet use. The circular design is a great alternative for locations where a square adapter won't work.
 
APCMAMPS25