


Ronstan Series 40 Ball Bearing Block - Single Upright Lead - RF40171
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
Ronstan Series 40 Ball Bearing Block - Single Upright Lead - RF40171Series 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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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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Reviewed in the United States on January 27, 2015
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Reviewed in the United States on May 26, 2026
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Reviewed in the United States on April 30, 2026
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It Works!!
Size: 5.1 Ounce (Pack of 2)
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