'Duckhead' Design Metaklett Fastener (VIDEO) Technical University of Munich (TUM) This video is under embargo. Please login to access this video. Caption The so-called Entenkopf or Duckhead design for spring-steel hook and loop fasteners, developed by researchers at the Technische Universitaet Muenchen. The device consists of hook tape and loop tape 0.2 mm thick. Numerous steel hooks can attach at any angle to the loops in the perforated metal loop tape. Credit TUM Institute of Metal Forming and Casting (utg) Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.