Very good Linkage for my heli 600 size. The long neck help to pass yoour servo arms and can fixed with a nut. Good product.They work great as a replacement of the poor quality links on the main rotor of HK 600 GT. These are really sturdy.Nice quality, balls are very smooth! I accidently ordered these ones when I wanted the once with the smaller screw. They will not got to waste though. I'm thinking 'Chinese Weight Tail Mod'. We'll see how it works out.Great balls! I changed my original HK600GT balls with that ones.
This balls are made from a hard steel. Screwing is 2.0mm hex precise. Much much better than original HK600GT that are made from soft metal and smaller screw holes.