Drill Collar
As an important part of drill string, drill collar can supply the drill bit and increase the rigidity of drill string. Dril collar are manufactured strictly according to API Spec7-1 standard with material of AISI 4145 Mod. We supply slick drill collars, spiral drill collars, etc. The size of drill collar we can provide is from 3.1/8 to 11 inches. We can also provide other drill collars at customers' specific request .
