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Explanation: A "Sterngriff" typically has six to eight flutes and ridges. According to reference sited, this is a fluted knob. Kreuzgriffe are Knobs with (three to) four flutes and ridges are called Four-Prong Knobs (or Tri-Prong knobs).
Google search: Sterngriff & Fluted Plastic knob Reid Tool Supply Company Catalog
Manfred Mondt United States Local time: 12:07 Native speaker of: German PRO pts in pair: 252