Infinitely adjustable to accommodate manual wheel chairs spanning 15.5" to 24" between the handgrips. Ergonomic handlebar reduces the strain on wrist, shoulders or back; allows for one handed maneuvering of wheelchair, allowing the use of cell phone, to carry a handbag or pull a luggage bag. No tools required - attaches quickly and easily over the handgrips of a manual wheelchair with a few quick turns. Raises height 4" to approximate height of standard shopping cart.