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A Drill collar is an essential part of the performance of ChrisCo downhole drilling tools. Drill collars provides weight on bit for drilling through formations. Rig drillers are able to monitor weight applied to bit by monitoring through simple calculations, and a weight indicator scale on rig floor. Drill collars are typically 31’ feet in length, very thick walled, and very heavy pieces of steel. They come box by pin with like connections, in order to mate as many needed, to achieve desired weight. Drill collars come slick OD, or machined with helical grooves (spiral collars). ChrisCo keeps a generous supply of carbon steel drill collars in stock (NON MAGNETIC coming soon).