


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
Quick Dispatch:
Your Ronstan Series 40 Ball Bearing Block - Single Upright Lead - RF40171 orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
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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.
- To process your return/exchange, please contact us at [email protected]
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4.1 ★★★★★
Based on 803 reviews
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Product Reviews
★★★★★ 5
Great hat
Size: One Size, Color: Grey
Bought this for my nephew for Christmas. He loves the fit and style of the hat.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 11, 2026
★★★★★ 5
Nice hat
Size: One Size, Color: Black
Nice fitting hat. Good quality
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 1, 2025
★★★★★ 5
Good
Size: One Size, Color: Grey
Good
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 11, 2026
★★★★★ 4
Good
Size: One Size, Color: Black
Good fitting hat.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 14, 2026
★★★★★ 5
Perfect Hat all the way around
Size: One Size, Color: Black
Been buying these hats since they came out ....Never disappointed.👌🏻
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 14, 2025
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