Here are the official sizing charts for the DekoRRa Mock Rocks which can be used to determine which mock rocks will best fit your project or application.
The charts are designed to display how much interior space is available at different given heights inside the DekoRRa Mock Rock cover. Notice how the amount of interior space (length and width) diminishes as the height increases.
This is due to the shape of each of the DekoRRa Mock Rocks which are tapered up towards the top. Even the square and rectangular shaped rocks such as the Model 117 and 104 are smaller up at the top vs down near the bottom.
The higher up inside the rock, the less interior space exists.