RAM 75mm X 75mm VESA 3.625" Plate with 1.5" Diameter Ball This RAM-2461U consists of a 1.5" rubber ball, connected to a 3.625" square plate with a 75mm X 75mm VESA hole pattern. The rubber ball is positioned 0.88" from the center of one edge. 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. The RAM-2461U is compatible with the following electronic devices: MobileDemand XTablet T8600 Glacier Computer Ridgeline Routeware DMS 5000