The RAM-337U includes a 1/4"-20 female thread hex hole connected to a 1.5" rubber ball.
Material:
Powder Coated Marine Grade Aluminum
Ball Size:
1.5" Rubber Ball Size
Note:
The "U" in the part number reflects product packaged in poly bag.
C size 1.5" (Holds up to 4 lbs)
Holder
Base
Adapter
Powder Coated Marine Grade Aluminum
Packaged in Poly Bag