8MM Lineman Belt8mm ropes are lighter, stronger and pack down smaller than the 11mm rope.. 8mm ropes work with Kong Duck or Ropeman 4 Ascenders. 8mm Lineman Belt With this rope we were able to develop the worlds first commercially available 8mm rope with a factory spliced eye. This is a big deal because splices are much stronger than knots by anywhere from 30% 50%. Our splices tested at over 90% rope strength. This is simply not possible with knotted loops. Spliced