The 4in Soil Density Mold Base provides a solid support for the 4in Soil Density Mold (sold separately). Made of corrosion-resistant zinc-plated steel, the 4in (102mm) Mold Base has a recessed opening to hold the Soil Density Mold in place. The included threaded posts and wing nuts are used to secure the Soil Density Mold, with or without the 4in Soil Density Mold Collar (sold separately).
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