This is the most used model of KELLY BAR.
In fact, thanks to the presence of teeth on each internal tube, during the work the elements block each other and generate downward pressure.
For this reason this kelly bar can be used also in compact and hard terrains (rocky terrains).
The size of the tooth depends on the power of the drilling machine.
ECDRILL srl can suppliers all type, model or brand of KELLY BAR (MAIT, TESCAR, SOILMEC, CASAGRANDE ecc ecc).
Thanks to our design skills we are able to design and create specific and custom KELLY BAR.