The NZG accessory set for the Liebherr LRB255 contains miscellaneous parts to demonstrate five different methods of drilling and piling:

1. Kelly Drilling: For this method, a kelly rod is used to guide and drive a drilling tool, usually a short auger. To support the wall of the drilled hole, casings are used which can be driven either by a second drive on the drilling head or by casing oscillator (both are reprodruced in this model).
2. Ring Vibrator: A ring vibrator is used to force steel casings, which are closed with a type of lid on the bottom, into the ground. The casings act as an support for the “drilled” hole and are retracted after pouring concrete into the hole.
3. Hydraulic Hammer: Hydraulic hammers are used to drive pre-made piles out of steel or concrete into the ground.
4. Double Rotary Drilling: For this method, a continous auger and a casing are counter-rotated and driven into the ground simultaneously. After the drilling, the concrete is poured into the hole through the core of the auger./li>
5. Continous Flight Auger (CFA): At CFA drilling, a long auger is used without any casing. The concrete is poured into the hole through the core of the auger.