The M5-0.8 x 10W10 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 M5 bolts. It is made of 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 design, which helps to distribute the load evenly. The washer is RoHS compliant and meets the JIS B1188 standard.