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The user creates two enormous rock formations that close in on the opponent from two opposing sides with tremendous force, smashing everything caught in between. Both of these formations are capable of dwarfing even the Demonic Statue of the Outer Path in size. This ability's destructive potential and its difficulty is often noted to be high. The technique can be used on a smaller scale against a group of few enemies.
The word sando is a Japanese abbreviation for the English word sandwich. The technique is written with the kanji for "mountain" and "earth", both pronounced with their onyomi, while they would usually be pronounced with their kunyomi as "yamatsuchi".
In the manga each one of the rocks has the symbol of Iwagakure inscribed upon it.