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Product Description O-rings are one of the simplest, yet most engineered, precise and useful seal designs ever developed. They are available in various metric and inch standard sizes. Sizes are specified by the inside diameter and the cross section diameter (thickness). From the Manufacturer O-rings are one of the simplest, yet most engineered, precise, and useful seal designs ever developed. They are available in various metric and inch standard sizes. Sizes are specified by the inside diameter and the cross section diameter (thickness).