Type QJ15 combined hand and air legged rock drill Weight 15 kg Overall length 550 mm Operating air pressure 0.35£0.55 *** I***ct energy 22N¡¤m Air-pipe bore(inner Dia.) 19 mm Water-pipe bore(inner Dia.) 8 mm Air consumption 1.3 m3/min Drill rod trailer 22 x 108 ¡À1 mm (the sides length of the hexagon) Drill bit ?2-38 mm Type FT80 air leg(optional) Leg length 1425 mm Propulsion stroke 950 mm Weight 13 kg