The Ring of Steel (Persian: <big>كمربندى شهرى كابل</big>, Kamerband-i Shahr-i Kabul, "Belt of the City of Kabul") was a series of 25 Afghan National Police checkpoints in the city of Kabul.[1] Set up in June 2010, the Ring of Steel was designed for security purposes and manned, who occasionally stop and check suspicious vehicles attempting to pass through.[2]