Made of 304 stainless steel material.Fixing component, industrial and construction fasteners.
Phillips drive that accepts a Phillips driver and is designed to prevent over-tightening.
Round head has a flat top and short vertical sides with a rounded top edge.
Machine screws are threaded fasteners that are typically used with nuts or drilled and tapped holes. 
Widely used in home, kitchen, electronics, communication, equipment, electric power products, cultural goods, machinery, etc.