Anti-slip, grooved surface. Adjustable to fit a range of threshold rises from 1″ – 2″, 2″ – 3.5″, and 2.5″ – 6″. Easy to install and aligns against the door. Adjustable to fit a range of threshold rises and accommodates wheelchairs, scooters, walkers, canes and many other accessible products. Free standing, lightweight and durable. Designed for many different types of doorways and can be used indoors or outdoors. Weight capacity 600 lb.