EPDM Bonded Sealing washer is matched with the roofing screw and the main function is improving the waterproof efficiency.
There are many sizes and the different thickness of the washers, such as steel sheet/EPDM Rubber(0.5/1.80, 0.6/2.0, 0.8/2.0, and other pointed thicknesses.
EPDM BONDED SEALING WASHER