Arm
The RAM C-size range of arms to suit 1.5" diameter balls is available in 3 lengths in marine grade alloy and 2 lengths in high strength composite construction.
As well as the ubiquitous RAM Double-Socket arms there are swing arms, Swivel arms, Swingles and RAM POD HD arms.
Nomenclature:
-B suffix implies a short arm (approx 64 mm effective length)
The medium arm has no suffix and is approx 115 mm effective length.
-D suffix implies a longer arm (approx 222 mm effective length).
Other options include security arms with built-in locks and aviation style mounting arms with the adjustment arm on a long extension to suit tablet mounts close to windows.