Bore：79.4mm Stroke：73.25mm Air Consumption：3.7M³/5bar Blows/MinuteBar：2050/5 Applied range:The GL250 rock drill  is mainly used in either rock drilling work such as mining and tun-neling, or in railway, water conservancy construction projects and stone work. It is suitable for wet drilling on hard medium hard rock, or for drilling horizontal or inclined blast holes.