Designed for extending the standard VESA 75x75mm and 100x100mm mounting to larger 200x300mm, 200x400mm, 300x300mm, and 400x400mm sizes.. Robust and durable - 5mm thick guaged rolled steel with a black finish. Makes it easy to attach a large flat TV. Suitable for Kupo VESA Screen Truss Mount (KG816612). Comes with M8 Allen Key and M4 screws.