Down the Hole Drilling Rig 1>Rock hardness:f=6~20 2>Bore Dia.(mm):68~130 3>Motor power:4KW 4>G.W.(kg):260 Pneumatic Down the Hole Drill HQF100:Features:1) High efficient and energy-saving.Use the hydraulic technique, with reasonable disposition and price, saving oil consumption. The support uses fluted disc for location, which makes the structure more novel. 2) Nimble to move, easy to operate. ...