The Threaded Stub is used in the drilling end of the Turbo Tunnel Bit and acts as a bit guide/center punch until the carbide teeth of the Turbo Tunnel bit grab into the concrete being drilled.
Acts as a bit guide/center punch
2-1/2 in. length threaded stud
Works with Large Hole System interchangeable drilling heads
Usable with the available SDS-max or spline shanks
Usable with 11 in. extensions, 48-20-5079, and can be coupled for extra deep drilling applications