Pin Drive Roller Kelly Bushing

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 can not 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.