Welded hydraulic pump and cylinder assures strength and eliminates leaks Chrome plated pump piston and ram for additional rust resistance and durability Extension screw provides height adjustment for maximum height Both manual and pneumatic for automotive applications Meets or exceeds ASME PASE 2019 standards Capacity (Ton): 20 Minimum Height: 9.65" Maximum Height: 18.70" Extension Screw: 3.15" Air Pressure: 100-145 psi Base Length: 8.66" Base Width: 6.89"