SP20MM17 is a versatile adapter that allows you to convert mounts with a 20mm mounting pattern (including Arkon Heavy-Duty models-sold separately) to a 17mm mounting pattern. This includes only the 20mm Ball to 17mm Ball Adapter. (Mounts, holders, and devices sold separately.) Secure the adapter onto any mount accommodating the 20mm ball pattern. Use the SP20MM17 adapter with current Arkon Heavy Duty Mounts, including the Multi-Angle Drill-Base Mounting Pedestal with 9" Adjustable Arm (Model HD006), Heavy-Duty Clamp Mounting Pedestal with 10" Adjustable Arm (Model HD004), or Heavy-Duty Seat Rail Mounting Pedestal with 22" Adjustable Arm (Model HD001) to make them compatible for mounting a Garmin GPS or other devices with a 17mm mounting pattern.
