A wood fastener is an object used to join two pieces of wood together. Common wood fasteners include pegs, screws, nails, tnuts, and dowels. Pegs are short cylindrical pieces of wood that are inserted into pre-drilled holes in the wood. Screws are metal fasteners with a helical ridge that are inserted into pre-drilled holes and tightened with a screwdriver. Nails are metal fasteners with a pointed end that are driven into the wood with a hammer. Tnuts are metal fasteners with a threaded hole that are inserted into pre-drilled holes and tightened with a nut. Dowels are cylindrical pieces of wood that are inserted into pre-drilled holes in the wood.