DTH-Rox NS

Robit® Non-Stop system is an advanced casing system that start to drill with a casing and then to continues beyond it without tool changes. 

No need to pull out the pilot bit and the drill string to replace it by a conventional down the hole bit. A single operation disconnects the pilot and the ring from the casing. 

The drilling can be continued free from the casing tube without losing the drilling diameter.