These inscriptions are carved into the granite rockface along the Gamla Turingevägen, or Old Turinge Road, which was once the main road from Stockholm into southern Södermanland, and was the forerunner of the modern Göta highway.
The three carvings are considered to have been made contemporaneously and all made by a runemaster with the normalized name of Östen (Eysteinn in the runic text), with his signature appearing on Sö 312.