Omega Technologies T201X37-4 Northrop Six-Wing Collar Removal Tool incorporates a hex side for collar installation, and a spline side for removal. This arrangement also prevents the re-use of removed collars. Omega Technologies is always available to answer your questions and make recommendations for the particular application in question. Omega Technologies also welcome user comments, suggestions, and feedback about our aircraft tools, their performance, suitability in various applications, and ways we might improve them.