Maximum compression:6600 B S-3tons Piston Stroke:320mm Piston Diameter:28mm Minimum Open:80*130mm Maximum Open:110*170mm Min Jacking Height:495mm Max Jacking Height:820mm Diameter of Spring:3000mm Compressible Length:210-750mm N.W/G.W:28KG/30KG Packing Size:1070*260*190mm