The post describes the necessary bomb-making ingredients as being easy to obtain, easy to dispose of quickly and difficult to detect, even by police sniffer dogs. It goes into detail about how to pack the bomb with shrapnel-like pieces of metal for maximum effect, what kinds of casings to use depending on where the bomb will be deployed, how to ensure the safety of the bomber and where to place a bomb to create the most carnage. They also advise would-be bomb-makers on how to cover their tracks so as not to leave evidence on the device. The conversation initiated by the post appears to involve knowledgeable individuals with a strong desire to spread their know-how to others.