Dual use - these wheels can be locked for fixed wheel or unlocked for a swivel wheel. Designed to fit most walkers they offer superior strength while remaining lightweight and easy to use. Special package includes our exclusive TG0081 Top Glides FlexFit Universal Ski Glides which are durable, quick to install, and designed for use on most surfaces. With 5-inch rubber wheels and 8 height adjustments these wheels are a smart and versatile choice.