Manufacturing varieties include: bore 63 mm - 400 mm Φ, stroke 3000 mm (schedule according to user needs design) under single scale, double telescopic column and all kinds of jacks. The manufacturing capacity is equipped with traditional boring - rough, fine honing oil cylinder and boring rolling process, and then fumble for a set of perfect cold drawing - oil cylinder processing technology. Seal selection of domestic well-known manufacturers or imported high-quality products. The anti-corrosion of the parts is electroless nickel - phosphorus alloy or chromium plating, the coating has good wear resistance and corrosion resistance, and the life span of the workpiece is greatly improved.