9 Sets 3/16 Zoll Federknebelbefestigungen, Flügelfederknebelbolzen, Knebelbolzen und
Design and Installation: The nut adopts a foldable wing design. When installing, first open a hole in the wall, then combine the nut, bolt and washer, hold the wing, put it into the wall hole together, and tighten the bolt as required.