The M4-0.7 x 25W9 JIS B1188 Phil Pan 304SS Split Washer 302/304SS Flat Washer Sems A2 Stainless is a high-quality washer that is designed to provide a secure and reliable connection. It is made from 304 stainless steel, which is resistant to corrosion and rust. The washer has a split design, which allows it to be easily installed and removed. It also has a flat design, which helps to distribute the load evenly. The washer is suitable for use in a variety of applications, including automotive, marine, and industrial.