Drilling equipment | Drill bits | Drill rods drilling equipment, drill bits, drill rods, crossover subs, stabilisers, drag buts, hole openers, casing, ancilliaries, Non return valves, casing centralisers, cement grout valves DCM Drillquip LTD are a privately owned manufacturer of high quality drilling equipment, including drill bits, drill rods, crossover subs, stabilisers, drag buts, hole openers, casing and ancilliaries.