Best in 7 days
![Ronstan Series 40 Ball Bearing Block - Single Upright Lead [RF40171]](https://cdn.shopify.com/s/files/1/0405/8454/4408/products/70615XL.jpg?v=1591347459)
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Ships within 48 hours · Estimated delivery Jul 8 - Jul 13
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For Your Every Summer RSVP, with Code: SUMMER15
Description
Ronstan Series 40 Ball Bearing Block - Single Upright Lead [RF40171]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
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
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]
- Please click here for more details>>> Return & Exchange Policy
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![Maxwell Seal Kit f/Freedom Series 1000 1500 Rope/Chain Windlasses [P90006]](https://cdn.shopify.com/s/files/1/0405/8454/4408/products/70228XL.jpg?v=1591346268)
Best in 7 days
4.9 ★★★★★
Based on 1696 reviews
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Product Reviews
★★★★★ 5
Silicone.mpisture docks
Color: 1pairs Grey
Daughter loved this
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 20, 2026
★★★★★ 3
Silicone Moisturizing Socks
Color: 2pairs Black
Fair to my feet because be carefully to walking
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 26, 2026
★★★★★ 5
Gel socks comfortable fit
Color: 2pairs Black
It was as stated. It fitted well and the size was the correct size.
Comfortable and wearable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 23, 2026
★★★★★ 5
great
Color: 2pairs Black
these fit just right so if you need gel socks you should gets these. also they fit great I am a size 12
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Reviewed in the United States on December 27, 2025
★★★★★ 2
No good
Color: 1pairs Black
Hold in them after 3 days
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Reviewed in the United States on April 15, 2026
