Suitable for very dense sand and gravel and weak rock (12.5 - 50 Mpa). With Betek Tungstuds (uncased) or wear strips (cased) as wear protection along body and bottoms. Fitted with Betek chisels and interchangeable bit. Rotating bottom in Hardox HB 500. 

Double cut is recommended in uncased bores or for bigger diameters and for secant pile walls.

The bottom gate can be opened manually or mechanically via a spring loaded pin.

A ventilation pipe prevents the development of a vacuum during extraction