The M5 x 16W10 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 wider 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 provides a smooth surface for the screw or bolt to bear against, and the split washer helps to grip the screw or bolt and prevent it from turning. This washer is commonly used in automotive and industrial applications.