... 36602.3680.31702.76602.3680.31752.95602.3680.31For drilling stones, concrete and brick walls, etc.Specification from 82mm to 600mm, ... .After welded on steel blank (segment type for reference):Bulk core drill for reference:When it is drilling:Inner box ... : core drilletc. For all natural stone such as granite, marble, sandstone, limestone, travertine, lava, popular stone. And concrete, asphalt, brick etc ...