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Pin Drive Roller Kelly Bushing The Pin Drive Roller Kelly Bushing is made up of top cap￡?bottom seat￡?shaft￡? roller floating ring￡?transmission pins￡?fixed bolts￡?oil cup￡?etc 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￡? 4. The contact between kelly and roller is rolling contact￡?so friction is lower￡?and weight on bit is accurate Specifications

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