Series 40 Ball Bearing Block - Single Upright Lead. Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Precision molded Acetal sheaves running on Acetal or Torlon ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range. Applications: Typically used for halyards at the mast base. Materials: Acetal ball bearings UV stabilized Acetal sheave Grade 316 stainless steel load housing. Great Product
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