SPECTRUM make Kelly bushing model SDHD is developed conforming to API-7K specifications for Square Drive Master Bushing for rotary table size from 27-½" to 49-½". This unit is used for heavy-duty drilling operations in high torque conditions at off-shore as well as on-shore drilling operations to handle Kelly size from 3" to 6" Square or Hexagonal.
Kelly Bushing is supplied along with the following:
Roller Assembly (Fitted)
Wiper Assembly (Fitted)