The powder coated marine grade aluminum base consists of a 1" diameter rubber ball connected at right angles to a 2" x 1.7" square base. The base has four pre-drilled holes at each corner, making the universal AMPs hole pattern.

Material:
Powder Coated Marine Grade Aluminum

Ball Size:
1" Rubber Ball "B" Size

Note:
The "U" in the part number reflects product packaged in poly bag. This base fits the GARMIN ZUMO 450 & ZUMO 550.