![Ronstan Series 40 Ball Bearing Block - Single Upright Lead [RF40171] Cartography | Navionics Platinum Plus Foreign UPC: 042237095633](https://cdn.shopify.com/s/files/1/0769/5908/8945/files/70615XL.jpg?v=1748376402)
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UPC: 042237095633
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Ronstan Series 40 Ball Bearing Block - Single Upright Lead [RF40171] Cartography | Navionics Platinum Plus Foreign UPC: 042237095633Series 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
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