The RAM-202U-225 consists of a 1.5" diameter rubber ball connected at right angles to a 2" x 2.5" rectangular base. This mount has pre-drilled holes at each corner of the base plate.Material:Powder Coated Marine Grade AluminumBall Size:1.5" Rubber Ball SizeNote:The "U" in the part number reflects product packaged in poly bag.Weight:0.24 lbs.