Rolling Jack for 4H110 and 4H850 CE Approved with 115% dynamic loading capacity and 150% static loading capacity tested. Pairs with four post lift to allow tire & brake work while on lift! Hydraulic hand pump operated. Two large rubber pads for vehicle contact. Rolling on 4 pulleys. The bridge jack is perfect for those who want to perform wheel service on a vehicle that is positioned on top of their four post lift. Minimum Height:5.3" Maximum Height: 18.3" Minimum Gap: 33.5" Maximum Gap: 45.3" Collapsed Pad Width: 36.6" Extended Pad Width: 52.6" Manual Hand operated Hydraulic pump.