The M2 x 8W5 JIS B1188 Phil Pan Split Washer Flat Washer Sems M/S Zinc Yellow is a type of screw that is used to fasten two pieces of metal together. It has a pan head with a slotted drive, and a split washer and flat washer that are attached to the screw. The split washer helps to distribute the load of the screw, and the flat washer helps to prevent the screw from sinking into the material. The screw is made of steel and has a zinc yellow finish.