FEATURES：
　·Designed for rock drilling in mining, quarrying and other stonework blastholes from multiple positions in medium-hard and hard rock.
　·YG40 is mounted on FJZ25A Column Rig, while YG80 on FJY25A Ring Rig.
　 ·YGZ170 Drifter Drills ,mounted on CL15 Crawler Rigs are primarily designed for rock drilling in openpit mines, hydropower stations and road construction projects,particularly suitable for making blastholes from multiple positions in medium-hard and hard rock.
　·The adoption of new designs such as special valveless air distribution mechanism and efficient rotational speed reducer.
　·The incorporation of a silencer and a well-matched air motor for rotation.