Roller Kelly Bushings

The Pin Drive Roller Kelly Bushing provides the following advantages:

   1.Pulling out or feeding off string can be done while rotating;

   2.Because of its integral construction, it cannot fly out and hurts you;

   3.The bushing is easily installed into the master bushing, maintaining good alignment;

The contact between Kelly and roller is rolling contact, so friction is lower, and weight on bit is accurate.