For free to contact Elaine: elaineliu318@yahoo.com.cn Y19A The rock drill is mainly used in samll quarries,small coal mines and limestone mines for drilling,blasting for constructing roads in mountain areas,alsoz in the capital construction for water conservancy works.it is suitable for drilling works in large mines for boulder blasting and other projects as well. Specification Weight 19kg Outside dimensions(L¡ÃW¡ÃH) 600¡Ã534¡Ã157mm Cylinder dia 65mm Piston stroke 54mm Air pressure 0.4~0.5Mpa Air pipe inner dia 19mm Water pipe inner dia 13mm Shank dimension 22¡Ã108mm When working pressure is 0.4Mpa 0.5Mpa Impact energy ¡Ã28J ¡Ã40 J Impact frequency ¡Ã28Hz ¡Ã35 Hz Idling speed ¡Ã180 r/min ¡Ã200 r/min Air consumption ¡Ã37 L/s ¡Ã43 L/s