Specifications Load Capacity: 4.5T (9900 lbs) Cylinder Piston Stroke: 320 mm (12.6") Cylinder Piston Diameter: 28 mm (1.1") Min. Support Bar Shaft Open: 75 130 mm (2.9" 5") Max. Support Bar Shaft Open: 90 175 mm (3.5" 6.8") Jack Lifting Height: 430~820 mm (16.9" 32.3") Height Adjustment: Adjustable with 7 holes on the column Gross Weight: 26 kg (57.3 lbs) Package Dimensions: 107 28 21 cm (42.1" 11" 8.3") Regarding the problem of not being able to raise after stepping on the accelerator, the solutions are as follows: In this case, the cylinder is getting air. The oil cylinder can be removed, raised to the highest, and the inverted cylinder pressed back. This action can be done 5-6 times in a row to expel air. What's included : 1 X 4.5 Ton Auto Strut Coil Spring Compressor 4 X Snap Joints 1 X Pair of Gloves VOGREX 4500kg Hydraulic Auto Coil Strut Spring Compressor in Red