Rehabilitation Advantage 9" Wheelchair Brake Handle Extensions can be installed easily. Simply remove the existing rubber knobs on your wheelchair brakes and slide the extensions into place. These extensions allow wheelchair users to independently lock their brakes. These extensions add 9" to the preexisting wheelchair brakes, and depending on the orientation of your wheelchair brake, these extensions may add additional width to your chair. Safely and conveniently lock your wheelchair into place without straining. These extensions allow for more controlled braking and reduce the chance of injury from exiting an unlocked wheelchair. Unlike other competitors, these Brake Handle Extensions are sold as a pair. Feel free to conveniently use both, or store the other away for a back-up. Purchase yours today!