Bomb, Ground, 6 lb was a British World War II grenade containing about 2 pints (1.1 L) of mustard gas.
It was intended to be used to contaminate trenches, dug-outs, rooms, observation posts and small enclosures, and on cross-roads, narrow defiles, obstacles and debris of demolition.
In the centre of the underside of the lid is a striker for use on the match composition head of the ejection charge.
In order that any leakage may be readily detected the plug is coated with detector paint.
The safety fuze is coiled in concentric circles in a shallow metal saucer and is set in bakelite cement.
The ejection charge is designed to blow out the end of the bomb fitted with the filling plug.