The low profile aluminum Threshold Ramp is ideal for use at doorways and thresholds from 1" to 5 1/2" in height. The 2" top lip seamlessly covers the existing threshold for a smooth transition and adjusts to varying heights. The welded construction and permanent skid resistant surface allow these threshold ramps to be used inside or outside. For use with wheelchairs and scooters. Photos are shown to depict the overall style and design of the ramp, not the actual measurement of the ramp. Please review all dimensions for the ramp you intend to order to be sure it will be suitable for your situation. Call our customer service team if you have any questions at 888-516-0077.