Manufacturer: Perlegear. It can bear a maximum weight of 88 lbs and is compatible with a wide range of VESA mounting hole patterns, including 100x100mm (4x4), 200x100mm (8x4), 200x200mm (8x8), 300x200mm (12x8), 300x300mm (12x12), 400x300mm (16x12), and 400x400mm (16x16).
eBay