Neoprene bonded washers are used to create an airtight seal between the bolt or screw and the fastening surface. The metal washer provides a larger bearing surface to strengthen the connection for high torque applications, while the neoprene cushions the joint against the fastening surface. Also called cushioning or sealing washers. Grade 18-8 stainless steel for outdoor applications, commonly used with self drilling screws.

Note: I.D. stands for inside diameter. O.D. stands for outside diameter.