The RAM-E-246U consists of a 3.38" rubber ball connected to a 4.75" square plate with 4x100mm holes and 4x75mm holes in each corner.

RAM Vesa 4.75" Plate with 3.38" Dia Ball (RAM-E-246U)
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The RAM-E-246U consists of a 3.38" rubber ball connected to a 4.75" square plate with 4x100mm holes and 4x75mm holes in each corner.