The RAM-D-202U-RM1 consists of a 2.25" ball connected to a 3.68" diameter round base that contains pre-drilled holes that connect to Raymarine devices listed below.
Specs & Features
Material: Powder Coated Marine Grade Aluminum
Ball Size: D Size 2.25" Rubber Ball
Note: The "U" in the part number reflects product packaged in poly bag.