The M4-0.7 x 8W9 JIS B1188 Phil Pan 304SS Split Washer 302/304SS Flat Washer Sems A2 Stainless is a high-quality fastener that is designed to provide a secure and reliable connection. The split washer is made of 304SS stainless steel, which provides excellent corrosion resistance. The flat washer is made of 302/304SS stainless steel, which provides good corrosion resistance and strength. The screw is made of A2 stainless steel, which provides excellent corrosion resistance and strength. This fastener is ideal for use in a variety of application