With ergonomic control knobs on each upright, the width of the Platform Mounted Parallel Bars adjusts 15" to 28. The satin-finish hardwood ends are for easy wheelchair access. It features two “anti-slip” treads on each end and 1.5" diameter one-piece stainless steel handrails. The black powder-coated heavy-gauge steel uprights and fittings. Each upright telescopes up to 13" and locks into nine height positions between 29" and 42" with fail-safe ball-tip locking pin.