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About this item These set screws are made from 12.9 grade carbon steel high hardness,durability and long service life. Oxidation finishing provides these set screws a cover of rust and corrosion protection. They are multipurpose hex socket head set screws that you can simple drive with a hex key. There are 8 common sizes and you can concentrate on your project without worrying about not having the correct screws. Get these total 280 pieces screws so you won’t be running off to the hardware store a set screw quite a while. No Description