"Silver Spring wheelchair threshold ramp is an easy and convenient way to transition thresholds, steps and elevated surfaces safely. The mobility threshold ramp is designed for outdoor residential use and features a 26"" x 28"" platform adjustable from 3"" to 6"" high. With an EZ-Traction superior grip surface, Silver Spring threshold ramps support up to 600 lbs. in all weather conditions and adjusts with easy to use twist-lock legs."