A joiner is used to join two pieces of wood together. A joiner uses a small tungsten carbide-tipped to cut a crescent shaped hole in the opposite edges of two pieces of wood or wood composite panels. An oval-shaped, highly-dried and compressed wooden biscuit 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 the bond. It is perfect for joining material together without unsightly fastener holes.