The sat-nms ACU-RMU is completely integrated into a 6RU 19inch case with standard mounting holes. The case of the sat-nms ACU-RMU is not strong enough to carry the complete unit only on the front mounting holes! Because of that, take care that the sat-nms ACU-RMU is placed onto a bar guide that carries the complete weight of the sat-nms ACU-RMU. The screws have to be fixed properly to keep the sat-nms ACU-RMU in its position.