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Screws are threaded fasteners that create permanent or temporary assemblies. They are inserted and removed by turning in one direction or another. Wood screws, floor screws, and sheet metal screws have flat heads that sit flush when holding material together. Machine screws fasten metal to metal and are inserted into a prethreaded hole or mated with a nut. Thread-cutting screws are self-tapping screws that cut away and remove the surrounding material to create a tapped hole. Deck screws resist rust and corrosion to hold outdoor decking materials together. Drywall screws have fine tips, coarse threads, and tapered bugle heads to penetrate drywall and grip wood without damaging material. Hex-head bolts, cap screws, and lag screws are driven with wrenches rather than screwdrivers or drill bits. Captive panel screws and thumb screws can be tightened and loosened without tools on parts that are frequently removed such as access panels. Screw caps can help to cover screw heads for both safety and aesthetic purp