Pipe bomb
A pipe bomb is a hand-throwable anti-personnel improvised explosive device (IED), a bomb made from a piece of pipe. From a technical point of view, a pipe bomb is a mechanically strong containment device, filled with an explosive material, that allows pressure to build until it exceeds the strength of the container at its weakest point; the device is designed to rupture and not to fail at a specific joint, thus resulting in a catastrophic destruction of the container, usually followed by the ejection of sharp shrapnels moving at high speed in all directions.