Casing shoe_3

 The casing shoe is a part of Ultra Maxbit (UMB). 

This part is used for connecting the ring bit to the casing pipe or pilot bit.

UMB is used for simultaneous drilling and casing in unstable ground formations. 

The dual bit system also allows vertical, horizontal, and even inclined drilling. UMB is also applicable 

for a wide range of ground conditions such as sand, gravel and boulders, and rock