The M3-0.5 x 12W7 JIS B1188 Phil Pan 304SS Split Washer 302/304SS Flat Washer Sems A2 Stainless is a high-quality fastener that is designed for use in a variety of applications. It is made from 304 stainless steel, which is known for its strength and durability. The split washer helps to distribute the load of the screw or bolt, while the flat washer helps to prevent damage to the surface of the material being fastened. This fastener is also RoHS compliant, making it safe for use in a variety of applications.