This M4-0.7 x 40W9 JIS B1188 Phil Pan 304SS Split Washer 302/304SS Flat Washer Sems A2 Stainless is a high-quality fastener designed for use in a variety of applications. The split washer is made of 304SS, which is a durable and corrosion-resistant material. The flat washer is made of 302/304SS, which is also a durable and corrosion-resistant material. The Sems A2 stainless steel screw is strong and durable, and it is resistant to corrosion. This fastener is ideal for use in applications where strength, durability, and corrosion resistance are