This RAM-D-2462U consists of a 2.25" rubber ball, connected to a 3.6" x 2.1" plate with a 35mm X 75mm VESA hole pattern.

RAM® 35x75mm VESA Plate with Ball - D Size (RAM-D-2462U)
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This RAM-D-2462U consists of a 2.25" rubber ball, connected to a 3.6" x 2.1" plate with a 35mm X 75mm VESA hole pattern.