The Roller Kelly Bushing is a necessary tool for drilling, by
matching with the rotary square to drivekelly pipe. The product can
reduce its friction with kelly by rotation of four rollers and
extend itsservice life. Change different rollers to match with
different square and hexagonal kelly pipes andconnect with
different rotary tables. Two transmission styles (square and
pinconnect) are available.
The product is designed and manufactured according to API Spec 7K "
Specification for Drill
Roller Kelly Bushings Images