VESA holder, 2.25 in.
VESA 75, 9.2x9.2 cm (3.625x3.625 in.), 2.25 in. ball (size D) - RAM-D-2461U
This rectangular base is a good foundation for your individual RAM Mount system.
This base has several holes, including the industry-standard VESA 75 (4 bore in rectangular arrangement with an edge length of 75 mm) and can therefore be used as carrier for devices in the VESA standard.
