The M6 x 10W12.5 JIS B1188 Phil Pan Split Washer Flat Washer Sems M/S Zinc is a type of fastener that is used to secure two or more pieces of material together. It consists of a pan head screw with a split washer and a flat washer. The split washer helps to distribute the load of the screw and prevent it from pulling through the material. The flat washer helps to prevent the screw from damaging the material. This type of fastener is commonly used in automotive and construction applications.