Drive Bariatric Wheeled Walkers feature nonskid wheels that have adjustable spring tension and automatically lock when downward pressure is exerted on the frame, preventing the walker from moving ahead of the user. The walkers won't tip when going backwards, and the steel frame has welded joints and features an adjustable width to accommodate larger individuals. Four wheels with swivel front wheels. The frame is designed to glide under the bed or chair for independent sit/stand transitions. It fits around standard wheelchairs and commodes for easy transfers. Stands independently when folded. There are also optional accessories you can add to make the walker even more useful.