This product is either discontinued or we cannot get that from suppliers.
Atdec - Vesa 400 Fixed (ADM-B-V400M) Ideal for assembling video walls and other multi-screen applications, these brackets are designed to mount medium to large sized screens on to modular horizontal mounting rails. The universal design is compatible with all video wall screens and the modular design allows an almost endless number of configurations to be assembled, in both landscape or portrait orientations