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Use the following table to estimate the interior space for the boulder 109:

Rectangular measurements of all rocks may have more space in the middle than listed due to width interference at the corners.  When choosing a rock enclosure for an application, note the shape of the rock as well as the application measurements.

Height (@) Length (max) Width (max) Diameter (max)
2 Inches 20
2 24 9
2 22 12
2 19 16  
4 Inches   17
4 21 13  
4 16 16
6 Inches   14
6 19 10
6 16 12
9 Inches   11
9 21 3  
9 16 8  
9 11 11  
12 Inches     8
12 18 3
12 12 6
14     5
14 12 2  
14 10 4  
14 8 5  
16     4
16 4 4