Socket Cap Screw is a type of socket screw that has a flat head with a raised, textured surface called knurling. The knurling provides additional grip, making it easier to tighten or loosen the screw by hand. This type of screw is often used in applications where frequent adjustments or manual tightening are required, such as in machinery, equipment, and automotive components. These Assortment Kits provides multiple sizes of product in a convenient utility box.