High Quality 304 Stainless Steel, material features strength and offers good corrosion resistance in bad environment.The magnetic properties of 304 stainless steel due to the structure transformation reasons are not at the same level as the magnetic properties of stainless steel of other materials, which means that the magnetic properties of 304 steel always show weak magnetic properties. hex grub screws are organized and decent in storage bags, Suitable for light fixture, precision machinery, apparatus, electronics, and other small repairs around the shop, garage or home. Set Screws are commonly used to secure an object within or against another object, such as securing a pulley or gear to a shaft. These set screws are Headless Screws which are commonly called Blind Screws or Grub Screws. These headless screws comes with a Hex Socket in which a Hex Allen Wrench is inserted for tightening and loosening of the screw. Set screws are also used in applications where a flat surface is important. we're committed to supply quality tools and accessories to worldwide customers to make your work more efficient and convenient! We're committed to creating great products backed by friendly, responsive service to delight our loyal customers around the world.