These tables improve the interface between the therapist and client with designs that are clean, never clunky, so you can perform procedures such as hand therapy, restorative therapy and powder therapy with ease. With a wide array of top shapes, all built with the therapist in mind, they help you and your clients make progress comfortably. Lifetime warranty. Knob adjustment range 23″-33″. Hand-crank adjustment range 27″-39″. Powered adjustment range 27″-39″. Gas assist adjustment range 24″36″. Lead time 15 days.