The Rotary Lift RJ9100Y 2BK air-operated scissor-style rolling jack assembly is essential for making your four-post or scissor lift more versatile. This device lets you lift a vehicle to carry out brake, suspension, or tire service without using the wheels. The runway jack includes rail engaging wheel assemblies that can be adjusted to suit runways with inside widths of between 40 3/4" (1035 mm) minimum and 49 1/4" (1251 mm) maximum. With a capacity of 9,000 lbs, this rolling jack is explicitly designed for the SM30 series 4 post lifts and comes with truck adapters, adapter extensions, and three different-sized rubber pads. The latch assembly locks at full-rise, and the jack rolls on four heavy-duty urethane compression wheels, making it easy to maneuver. So, if you are looking for a reliable and versatile tool for your passenger cars/trucks, the Rotary Lift RJ9100Y 2BK runway jack is an excellent option.