"Easily overcome a step or other rises with the Silver Spring Aluminum Adjustable Threshold ramp. This ramp comes with stainless steel legs and threaded screws that enable you to adjust the height of the ramp from 3.5"" to 7.5"". The bottom of each leg has a swivel foot mounted on a ball joint to provide stability on slightly uneven surfaces. This ramp is perfect for either odd size rises or when you need to use a threshold ramp in different parts of your home, office or warehouse. Please note that this ramp is specifically designed for use with doors that open inwards only. Our threshold ramp is made from high-strength aluminum with an epoxy-based grit coat surface for great traction in all weather conditions. The edges of the ramp are painted a bright yellow for high visibility. With a 400 lb. weight capacity this threshold ramp can be used with wheelchairs, scooters and most power chairs. Pre-drilled holes are included for optional permanent mounting."