A biscuit joiner or sometimes plate joiner is a wooworking tool used to join two pieces of wood together. A biscuit joiner uses a small 100mm (4") diameter tungsten carbide tipped circular saw blade to cut a crescent shaped hole (called the mouth) in the opposite edges of two pieces of wood or wood composite panels. An oval-shaped, highly-dried and compressed wooden biscuit (usually beech) is covered with glue, or glue is applied in the slot. The biscuit is immediately placed in the slot, and the two boards are clamped together. The wet glue expands the biscuit, further improving a bond that is often stronger than the wood itself.