Transforming an ordinary walker into a sturdy carrier, this walker tray helps transport meals, magazines, and necessities while you walk. With two recessed cup holders and raised edge to prevent slide offs, walker tray fits through walker's side bars adding independence and convenience. Plastic. Walker tray fits through side bars of standard walker, 16" length between side slots; slots measures 11 3/4" long x 2" wide. Measures 21" long x 16" wide x 1" high overall. Not compatible with hand-braking walkers. No express shipping.