This optional scissor-style rolling bridge jack provides you with the ability to raise 2 or 4 wheels off the runways, making your 4-post Dannmar lift more versatile and allowing you to do wheel or brake work with ease. The telescoping roller design allows the runways to be adjusted for different tread widths, so you don’t need adapters to work on different vehicles. The ability for the DRJ-6 to reach anywhere beneath the vehicle is attributed to its steel rollers that allow you to easily manipulate where the bridge jack is placed beneath the vehicle. Dannmar rolling jacks are designed to be easily installed and easily removed. Just move your DRJ-6 out of the way when you need the space. Each jack comes complete with three safety-lock positions and stackable pad adapters to provide added clearance when needed. Included commercial-grade air-hydraulic pump requires 125 psi and 10 – 20 CFM.