Wire blocks are low friction designed to carry wire halyards and control lines. The polished stainless steel sideplates are light and strong. They offer superb chafe resistance with wire halyards and controls. Hardkote-anodized, Teflon-impregnated aluminum protects and extends sheave life Flared stainless steel sideplates prevent line chafe and friction when leads are unfair Sideplates rotate open to insert preswaged or Nico pressed wire fittings Use for wire halyards, vangs and control lines