Three piece set 6", 12" and 18" flexible extensions. Use on 1/4" drive applications. Low profile female end features a locking set screw for a positive grip. Use with 8001D bore brush set for accessing transmission valve bodies and similar hard to reach applications. Use for hand torque applications only Locking set screw on the female end sets flush to ensure access to cramped areas without loosing the bit. Perfect for use with the bore brush set 8001D.