... bit : 56, 60, 76, 96, 113, 123, 133 and 153mm outer diameters. PDC core bit : BQ, NQ, NQ3, HQ, HQ3, PQ, PQ3 ... : geotechnical exploration, Mining exploration, Oil exploration and hydrapower station grouting project ( wireline core drilling and double-tube core drilling)1.Drill rod:BQ,NQ ... tube & inner tube wrench, foot clamp,etc. PDC bit for core and nocoring,carbide, stronger, long life