The M5 x 10W10 JIS B1188 Phil Pan Split Washer Flat Washer Sems M/S Zinc Yellow is a type of washer that is used to distribute the load of a screw or bolt over a larger surface area. It is made of zinc-plated steel and has a split washer design that helps to prevent the screw or bolt from loosening. The flat washer helps to distribute the load evenly and prevent damage to the surface of the material being fastened. This washer is commonly used in automotive, construction, and other industrial applications.