The Anti-Tank Mine General Service Mark II was a British anti-tank blast mine used during the Second World War. It consisted of a body about 7.5 in (190 mm) in diameter and 3.25 in (83 mm). The mine has a central fuze well accessed from the bottom, with a main charge in a cavity around the well consisting of about 4 lb (1.8 kg) of TNT. The mine is fitted with a thin brass cover, which acts as a pressure plate. The cover is suspended over the main body of the main by four leaf springs. A Sorbo ring (Sorbo rubber sponge) can be fitted between the cover and the mine body, which absorbs shock and blast and allows the mines to be planted as close as two feet (0.61 m) without causing sympathetic detonation (normally five feet is the minimum safe distance).