The RAM-220U is a half rail clamp base with 1.5" rubber ball that will connect to rails from 1" to 1.25" in diameter.
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)
Base
Powder Coated Marine Grade Aluminum
Handlebar/Rail
Packaged in Poly Bag