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The 12 mm Washer Pack of 5 is a set of washers used for distributing the load of a threaded fastener, like a screw or nut, to prevent damage to the surface being fastened. Each washer has an inner diameter of 12 mm, suitable for various fastening applications. Used in conjunction with screws and nuts to distribute the load and prevent damage to the material. Employed in plumbing applications to create a tight seal and prevent leaks.