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Some backreamers have built in swivels and others require external swivels. The backreamer is a cutting/mixing tool attached to the end of the drill string that is pulled and rotated through pilot bore to enlarge the path.
Function:
Cut Soil/Rock
Mix Soil/Rock
Attaching point for material that is being pulled
Delivering fluid for removal of soul, lubrication and wall building to keep the bore path open
