Hillman Zinc-Plated Steel No. 12 x 9/16 in. Bonded Neoprene Washer 100 pk

Bonded sealing washers are a single piece metal and neoprene sealing washer. The metal side absorbs the pressure of a nail head or screw while the neoprene side forms a tight water resistant seal. Often used outdoors in metal applications. Rust resistant. *