... a light, high efficiency, multi-function hewn hole drilling equipment, it is mainly applied to drill hewn cisterns, agricultural irrigation ... big crock diameter of hydraulic cylinder propulsion, name factory multi-cylinder engine for hydraulic system provide motivation, two levels ... 16-30Diameter of the drill pipe(mm) φ79,φ89,φ10Length of the drill pipe(mm) 3000Diameter of the drill head(mm) φ115- ...