1These set screws are made from 12.9 grade carbon steel for high hardness, durability and long service life 2Oxidation surface finishing provides these set screws a cover of rust and corrosion protection 3They are multipurpose hex socket head set screws that you can simple drive with a hex key 4There are 8 common sizes and you can concentrate on your project without worrying about not having the correct screws 5Get these total 200 pieces screws so you won't be running off to the hardware store for a set screw for quite a whileDescription: _x000D_A set screw is a type of screw generally used to secure an object within or against another object without using a nut. The most common examples are securing a pulley or gear to a shaft. Set screws are fully threaded and has no head projecting past the major diameter of the screw thread. These set screws are driven with an internal-wrenching hex socket drive. _x000D__x000D__x000D_Features: _x000D_These set screws are made from 12.9 grade carbon steel for high hardness, durability and long service life. _x000D_Oxidation surface finishing provides these set screws a cover of rust and corrosion protection. _x000D_They are multipurpose hex socket head set screws that you can simple drive with a hex key._x000D__x000D_There are 8 common sizes and you can concentrate on your project without worrying about not having the correct screws._x000D__x000D_Get these total 200 pieces screws so you won't be running off to the hardware store for a set screw for quite a while._x000D__x000D__x000D__x000D_Specifications: _x000D_Material: 12.9 grade carbon steel _x000D_Surface Finishing: Oxidation _x000D_Color: Black _x000D_Size and Quantity: _x000D_M3x3mm 25pcs _x000D_M3x4mm 25pcs _x000D_M3x5mm 25pcs _x000D_M3x6mm 25pcs _x000D_M3x8mm 25pcs _x000D_M3x10mm 25pcs _x000D_M3x12mm 25pcs _x000D_M3x14mm 25pcs _x000D__x000D__x000D_Package Includes: _x000D_200pcs x Screws