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Wood screws are designed to attach two pieces of wood together. They generally feature a smooth, unthreaded shank below the head which ensures a tight attachment, and the threaded portion of the shank is tapered to increase the holding power. Threads specially designed for use in wood effectively resist pulling out. Brass is rust proof, corrosion resistant and polishes to a rich, golden color. Brass is easily soldered and brazed and accepts plating readily. The typical composition is 70% Copper and 30% Zinc. Strength increases with a higher percentage of Zinc.Flat head fasteners are designed to fit flush to the surface when used with countersunk holes. Length is measured from the top of the head. Common applications for slotted screws include woodworking, although the drive style is not designed to be used with power drivers.