Spiral Pile
The grounding screw are suitable for most following land:
1) Topsoil: Sand, gravel, silt.
2) Flowing sand: Liquid and muddy ground water.
3) Friable soil: Loose sand, Gravel or mixed.
4) Middle heavy friable soil: Sand, gravel, silt and clay.
5) Difficult soils: More than 30% are stone which diameter bigger than 63mm.
6) Moveable chisley soil: With rock, fay, crispness, slate, rotten soil.
7) Moveable stereoplasm rock: Little rock with high structural strength jointed and weather-defined
8) picture
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