18-8 / 304 Grade Stainless Steel Split Ring Lock Washers. These are Medium Profile Spring Lock Washers. Split Ring Lock Washers are Commonly Used With a Varity of Fasteners Including Bolts, Screws, and Nuts. Made of 18-8 / 304 Grade Stainless Steel. These are the Most Popular Variety of a Spring Washer for Many Production Applications.