This viewfinder bracket is universal and designed for all monitors, recorders and viewfinders equiped with a 1/4'' threaded hole, to mount to any NATO rail. The quick release NATO rail concept offers a strong, stable and lightweight connection, preventing the viewfinder from "twisting", which can result in a crooked horizon of the image. There is various assortiment of NATO rails available, like single rails to mount to 1/4'' threaded holes, NATO rail to standard rosette and NATO rail to 15mm bar. All NATO rails are available in different lenghts.