THIS TOTALLY UNIQUE BRIDGE RAMP AUTOMATICALLY ADJUSTS AS IT IS PLACED TO SUIT ALL THRESHOLD TYPES, WITH NO USER ADJUSTMENT REQUIRED! Your benefits: So fast and easy to use, and perfect for any mobility device Low profile design for a shallow and safe gradient Two convenient sizes to cover thresholds of up to 6 inches or more All weather full width non-slip surface folds inside when carrying for extra safety, with integral comfort carrying handles