Bee Line's 7800 Auto-Lock Heavy Duty Floor Jack is designed for safety and durability. A self-locking mechanism automatically engages when the jack is raised, providing an independent backup to the jack's hydraulic system for improved safety. The air-over-hydraulic scissor design provides a smooth vertical lift and a stable platform for the underside of the truck. The jack lifts from 8" to 18" and has a 14 ton, 28,000 lbs capacity.