Jack Structure can be divided into two kinds of mechanical and hydraulic. Mechanical jacks have a rack with two spiral from the weight of small, laborious operation, generally used only for mechanical maintenance work. Hydraulic jacks: manually or by power-driven hydraulic pumps, hydraulic system drive as the top piece with the cylinder or piston. Hydraulic jacks can be divided into integral and separate. Integral pump and hydraulic cylinder together into one; separate pump and hydraulic cylinder separation, the middle with a high pressure hose associated hydraulic jack structure compact, smooth, self-locking effect, it is widely used. The disadvantage is the limited lifting height, lifting slow. The horizontal jack is widely used in heavy vehicles or mobile equipment weight supporting device to adjust the level of equipment is an important hydraulic components, it is mainly used in factories, mines, transportation and other departments as vehicle repair and other lifting, support work. 2 tons of horizontal jack QK2 345 Technical parameters: hydraulic jacks GW / NW maximum height minimum height from the weight Packing size horizontal QK2-of-345 7/6.5KGS 345 (mm) 135 (mm) 2 (T) 46 x 21 x 15 cm