The Miltistar large propellers are superior, beautifully made, very stiff and very lightweight, but they fit only one type of motors. I want to use them with Dualsky 5015 or Dualsky 7010 that have mounting holes respectively 4 x 12mm or 4 x 15mm, both M3 with shaft Φ4. So using my cnc router I made the new holes.