Crawler Drill Rig HC725A: 1>Rock hardness f=6~20 2>Bore Dia.(mm) ... >Main motor power 20kw Crawler Drilling Rig, Portable Drilling Rig HC725A:Features:1. Dust extractor can reduce the dust and keep ... )6200Impacter matchedDHD340 or DHD350 Crawler Drilling Rig, Portable Drilling Rig HC725A