The RAM Dash Mount consists of the 1" dia. ball and socket system with RAM Composite Cradle for these Garmin GPS:

GPSMAP 176
GPSMAP 176C
GPSMAP 196
GPSMAP 276C
GPSMAP 296
GPSMAP 396

The "U" in the part number reflects product packaged in poly bag. For additional specifications, see components and drawings tabs.  
 
MATERIAL:  Powder Coated Marine Grade Aluminum
 
BALL SIZE:  1 Inch Rubber Ball
 
COLOR:  Black Powder Coat
 
WEIGHT:  0.68 lbs