... of NOV corporation.Core components of drilling rigs are imported from America. Drilling rig partsConforming to the requirements of ... device f or convenient and reliable operation.The main parts are made of alloy steel with high strength, ... 21/32Weight kg(1bs) 21804806 3420754034967707 Drilling rig Hook ,DG225,DG315,DG450,hook for drilling,drilling rig,oil drilling machine,drilling rig square parts,