The M2.5-0.45 x 6W5 JIS B1188 Phil Pan 304SS Split Washer 302/304SS Flat Washer Sems A2 Stainless is a high-quality fastener that is perfect for a variety of applications. The split washer is made of 304 stainless steel, which is corrosion-resistant and durable. The flat washer is made of 302/304 stainless steel, which is also corrosion-resistant and durable. The screw is made of A2 stainless steel, which is strong and durable. This fastener is perfect for use in a variety of applications, including automotive, marine, and industrial.