The rotary drilling straight augers are drilling tools which suitable for clay layers, strongly weathered layers, and gravel layers. Single cut and double cut augers with side cutters are suitable for drilling hard clay, silt, and medium to high-density sand and gravel. Single cut auger are recommended up to coarse gravel.

The rotary drilling cone augers are used for drilling holes in dry soil and rocks, suitable for formations such as pebble layers, mudstone, sandstone layers, and strongly and moderately weathered hard rock layers. The double headed auger is subjected to uniform force and should not deviate from the hole, it has strong slag carrying capacity, viscous formation, and single helix is easy to unload slag.