The M2.5-0.45 x 20W5 JIS B1188 Phil Pan 304SS Split Washer 302/304SS Flat Washer Sems A2 Stainless is a high-quality washer that is designed to be used with a variety of fasteners. It is made from 304 stainless steel, which is known for its strength and durability. The washer has a split design, which allows it to be easily installed and removed. It also has a flat surface, which helps to distribute the load evenly. This washer is ideal for use in a variety of applications, including automotive, marine, and industrial.