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The Owlett-Jaton OJ000022 Sela Washer has a M8 bore and is ideal for securing roofing sheets to create a watertight seal.
When using spring head roofing nails just a Sela washer is required as the head of the nail will cover the entire washer to provide a watertight seal.
If using hook bolts you will also require a Sela Cover to cover the washer and nut to complete the seal.