... Equipment ltd., is the main professional manufacturer of drilling tool in china, and specializing in ... the design and manufacture of premium diamond drilling tools for the world engineering ... core drilling and double-tube core drilling)We produce a wide range of drilling tool including drill rod ... BQ, NQ , HQ, PHD, BT, NT, HT casing tube: BW, NW, HW, HWT2.Core barrel: BQ,NQ,HQ ...