... ,etc.According to various layers, it can be drilling with hard alloy bit,augerblt ,etc.FeaturesIt has large inputpower, ... fed structureIt adopts ball-jamming clamps or hydraulic clamp,structure with oil pressure feed device, GXY-lA, lB, 1C drilling ... working efficiency is very high. It can be equipped with drawing mechanism with strong mobililyHaving compact structures and light weight, convenient to ...