This optional scissor-style rolling bridge jack offers peerless jacking speed and convenience. The RJ-7 provides you with the ability and added versatility to raise 2 or 4 wheels off the runways, making automotive service such as brake jobs and suspension work a cinch. Their exclusive telescoping roller design allows the runways to be adjusted for different tread widths, so you don't need an adapter to work on a variety of vehicles. Reaching the factory approved jacking points has never been easier—the precision rollers enable you to position the RJ-7 anywhere beneath the vehicle. Our rolling jacks are designed to be there when you need them and gone when you don't. Just remove your RJ-7 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.