... lower air pressure, could work easily at limited sites. KQ90Y down hole drill with simple structure and lighter weight lower air ... ,it is good for the small mining areas in the productivities of 200,000m3 annually, or serves as the auxiliary equipment of the large or medium mining ... .7KWWeight2.6t (without drill tool)Drill toolsXHH90 ,XHH110, DHD90, XHHG110 down-hole drilling rig of KQ90Y