The M3-0.5 x 25W6 JIS B1188 Phil Pan 304SS Split Washer 302/304SS Flat Washer Sems A2 Stainless is a high-quality, durable washer designed for use in a variety of applications. It is made from 304 stainless steel, which is resistant to corrosion and rust, and has a split design that allows it to be easily installed and removed. The washer has a diameter of 3mm and a thickness of 0.5mm, and it is designed to be used with M3 screws. It is also RoHS compliant, making it safe for use in a variety of applications.