They are non-venomous. Though docile and harmless, it may be confused with the very venomous stiletto snake. Adults regularly reach 40 cm in length, but some grow to 64 cm.
By Bernard DUPONT from FRANCE - Cape Wolf Snake (Lycophidion capense), CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=40724556
Slang
They feed mostly on geckos and skinks which they bite and kill by constriction. They are believed to reach the age of 15 to 20 years.