This Modular Threshold Ramp provides a total raise of 150mm (5.5\'\') and is part of a series of products that can be used to negotiate thresholds of varying height, this being the largest option available.The individual components link together easily and are extremely light but strong, bearing loads of up to 1 ton per square inch. They are also very easy to install and their corrosion resistant design makes them suited for both temporary and permanent use, indoors or out.