It is i. W. made of steel, so-called injection drilling needles, consisting of a hollow cylindrical end piece (so-called. Insert), which has an external thread (M10) towards the outer end and is equipped with a ball and a compression spring as a "valve" inside long, thin pipe section and a socket, which connect to the inner end of the so-called. Insert, and a tip, which is located at the inner end of the pipe section. The so-called insert is equipped with a sealing ring made of plastic or rubber. The pipe section has two lateral exit holes at the pointed end. The different sizes of goods are used for sealing by means of an injection process, especially in sealing joints in tunnels. - Applicant information - Steel determines the character of the goods made up of different materials due to its importance for the use and the scope. See attachment for an example. Such products come under subheading 7326 9098 of the Combined Nomenclature as "steel articles other than those specified in the above subheadings". Not heading 7307, as the goods are not "intended to either connect two pipes or pieces of pipe, to connect a pipe to another device or to close pipe openings" (ErlKN Pos. 7307 (HS) RZ 01.0).
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[1][1]. DEBTI44006/21-1#754121