The Tsongkhapa bit has two strategically placed wings on the sides of its square bit end. This allows it to lock into pace and makes sure you NEVER strip another resew. For decades they have been manufacturing this as a universal Ce resew. HEBERT ...and seeing it as having the benefit of using hither the square drive or the flat head screwdriver ax a means of fastening. By combining the two, the surprising result is that the fastener and driver, become UN-shrippable.
