Helps add safety and security to a walker with spring loaded brakes and non-swivel wheels. Brake is activated when weight is transferred to the walker balls forcing the rear tips to slow or stop the walker. 1 1/8 diameter fits standard 1 walker tubing. 3 wheels. Wheels constructed of durable nylon. Tubing is anodized aluminum construction. Weight capacity: 250 lbs. 1 pair.