Adjustable Height Rollators 6" Casters by Drive Medical.

Features:

Universal height adjustment on frame allows seat height to be adjusted from 18" to 22" in 1" increments.
Comes with seamless padded seat with zippered pouch under seat for added privacy and security of personal items.
Removable, hinged, padded backrest can be folded up or down.
Caster journals are offset to provide strength.
Easy-to-use deluxe loop locks.
Brakes with serrated edges provide firm hold.
Ergonomic handles are easy to grip and are adjustable in height with self-threading knob.

Singles.

Drive Medical Adjustable Height Rollator with 6 in Wheels