Our set screws areMade of stainless steel, hex socket, cup point,male thread,grub screws. Set screws are used in applications where a flat surface is important, such as handles, grips, surfboard fins, and furniture or machine assembly. Widely used in electronics, communication, equipment, electric power products, cultural goods, environmental protection machinery, etc Note: 1.Actual product may vary slightly from photos shown. Please allow us to have some slight measurement errors. 2.Please feel free to contact with us if there is any quality issue, we will try our best to make you satisfied.