The M5 x 8W10 JIS B1188 Phil Pan Split Washer Flat Washer Sems M/S Zinc Yellow is a type of fastener that is used to secure two or more pieces of metal together. It is made of steel and has a zinc-plated finish for corrosion resistance. The washer has a split design that allows it to be easily installed and removed. The pan head design provides a large bearing surface for even distribution of load. The washer is suitable for use in a variety of applications, including automotive, construction, and manufacturing.