Today @bel-metric, we're going to show you the features of our bonded sealing washers. These washers are comprised of two parts--an outer ring of zinc-plated steel and an inner NBR ring. They are suitable for a variety of sealing applications, including gasoline, diesel, oil, water, air, as well as drain plugs. They are available in sizes ranging from M5-M30 on belmetric.com.