These type 18-8 stainless steel neoprene bonded washers, also know as sealing washers are strong and provide a tight grip around the screw. The neoprene rubber is bonded to the washer and offers a good watertight seal. Type 18-8 stainless steel has a high resistance to rust and corrosion and may be mildly magnetic. Type 316 option is available upon request. Click each size below for more information.