STROLLER/ WALKER , 18" WIDTH WALKER, 21" WIDTH BASE, 3" TWIN CASTERS, HEIGHT ADJUSTABLE, SOLD AS EACH MJM 10000133Stroller Walker , 18" Width Walker, 21" Width Base, 3" Twin Casters, Height Adjustable, Sold As Each Mjm 10000133 Mjm Ambulatory Walkers "400" Series Mjm Ambulatory Walkers "400" Series Height Adjustable. Solid Base With Soft Cushion. Wider Base For Better Balance. Casters (4" X 1 1 4") Come With Removable Bolt Nut For Easy Maintenance. All Casters Have Threaded Stem And Are Double Wall Reinforced With Schedule 40 1" Pvc. Stroller Walker , 18" Width