Wedge

A wedge is a thin triangular piece of wood or metal that is driven into another material in order to widen the material. This may cause the material to crack (in the case of stone) or two tighter the fit of a material into another (ie when fitting the handle of an axe).

Care must be taken when using an axe or similar tool or weapon to ensure that the wedge is secure and properly fitted, to ensure the head remains on the handle.