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1579398 is a part number belonging to Bossard, a global supplier of fastening elements, industrial parts, and logistical services. It is likely a Fastening Element, and could be either a Hexagonal Nut, Hex Nut, Hex Cap Nut, Eye Lollipop, or something else in the brass and steel range. The exact dimensions and features of this particular part number will need to be verified with Bossard.