Internal ratcheting jack with 14 inches of vertical travel - almost a foot higher than conventional dollies. U-shaped chassis that provides close, unhindered access to work area. A design that accommodates - and securely holds - almost any truck wheel, including wide-based singles, without restraining chains. Heavy-duty ball bearing wheels mounted under ball bearing swivel casters for maximum maneuverability. Rugged structural steel tubing construction that meets the demands of the toughest shop environments. Foot-operated wheel lock.