Sony brand drill rods are providing with a superior surface finish and tolerance which drastically reduces the risk of scaling from the pipes  entering the hammer, a major cause of premature hammer failure. The joints are friction welded to achieve maximum strength, and the threads of the end-pieces are heat treated for optimum durability and strength of  the thread profile. Every drill rod processed with induction hardening up to 44 HRC with 3mm depth.

Gunas Rigs India Pvt. Ltd - A Drilling Rig Manufacturer