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Flange Base for 1" Square Tube – Modern Studio Equipment.
8914: Flange | Wagner Companies
CROSO CN4900110 Wall and Floor Flange for Connection Square Tube 40 x 40 x 2.0 mm, Stainless Steel V4A, für Anschluss Vierkantrohr 40 x 40 x 2,0 mm, Silver - Amazon.com