Description:A set screw is a type of screw generally used to fasten an object within or against another object without using a nut. The most common examples are attaching a pulley or gear to a shaft. Set screws are fully threaded and no head protrudes beyond the main diameter of the thread. These set screws are driven by an internally driven hex socket drive.Features:These set screws are made of 304 stainless steel for rust protection, durability and long life.These are versatile hex grub screws that you can easily use with hex keys. There are 12 common sizes and you can focus on your project without worrying about not having the right screws.Get a total of 240 pieces of screws so you won't find yourself at the hardware store for a set screw for a long time.Well packaged and assorted in a resealable transparent box for convenient transportation and storage.Features:Material: 304 stainless steelType: Hexagon socket screwColor: silverSize and quantity:M3*3 20pcsM3*4 20pcsM3*5 20pcsM3*6 20pcsM4*4 20pcsM4*5 20pcsM4*6 20pcsM5*5 20pcsM5*8 20pcsM6*6 20pcsM6*10 20pcsM8*8 20pcsPackage includes: 240pcs x screws5pcs x Hex Keys (M1.5, M2, M2.5, M3, M4)