QJ15 pneumatic rock drill processed more advantages of low weight , compact structure , handy use and lower air consumption. It¡¯s mainly used in the small mines, small water conservancy prospecting, highway or traffic construction and national defense projects facility for drilling & blasting works. Product Specifications Weight 15 kg Length 550 mm Cylinder Dia. 58 mm Stroke 45 mm Working Pressure 0.4-0.5 Mpa Water Pressure 0.2-0.3 Mpa Impact Energy ¡à 22 J Impact Frequency ¡à 31 Hz Air Consumption ¡à 21 L/s Air Pipe Inside Dia. 19 mm Water Pipe Inside Dia. 8 mm Drill Bits Dia. 32-48 mm Max. Drilling Depth 5 M Drilling Rod Size H22 x 108 mm