The RAM-D-246U consists of a 2.25" rubber ball connected to a 4.75" square plate with 4x100mm holes and 4x75mm holes in each corner.

RAM 4.75" Square Vesa Plate with D Size Ball (RAM-D-246U)
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The RAM-D-246U consists of a 2.25" rubber ball connected to a 4.75" square plate with 4x100mm holes and 4x75mm holes in each corner.