It is a so-called fastening adapter made of steel, essentially consisting of an approximately rectangular base plate, a helical spring, a nut with an internal thread and another steel plate which is angled twice in opposite directions towards the narrow sides. The rectangular base plate has notched grooves along both narrow sides. The products are made of different types of steel, depending on the design, and are used to attach clamp combinations to mounting rails. - Applicant details - see attachment for illustration. Such products are classified as "threaded steel articles similar to nuts" under TARIC code 7318 1900 90. Not heading 8421, since goods of heading 7318 are parts of general use according to note 1 (g) to section XVI i. V. m. Note 2 Paragraph 1 a) to Section XV does not belong to Section XVI (Chapter 84).
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[1][1]. DEBTI35732/21-1#753180