Ronstan Series 40 All Purpose Block - Single Upright Lead - RF41171

Ronstan Series 40 All Purpose Block - Single Upright Lead - RF41171

Marsoni

M251S

$40.99

Get it in 3 business days with 1 day shipping. Friday, May 29

Ronstan Series 40 All Purpose Block - Single Upright Lead - RF41171Series 40 All Purpose Block Single Upright Lead Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Ideal for high load applications. Wear resistant sheave material, in lightweight, self lubricating polymer, is suitable for use with rope or wire. Applications: Typically used for halyards at the mast base. Materials: UV stabilised acetal sheave Grade 316 stainless steel load housing

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We offer a 30-day return/exchange service after receiving.
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I have used this brand exclusively on my BMW (110K) and Volvo (90K), with synthetic oil changes at 6000 miles religiously, and neither burns a single drop of oil. I have never seen any "failure" of the filter, which remains firm until the end. Unfortunately the price advantage has been eroding over the years- boo. So lost a star for that-

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on March 23, 2015

Verified Purchase

Daniel

Pawtucket, US

★★★★★ 5

Only oil filter you should buy if you have a Volvo

Only filter you should be buying if you own Volvo

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on July 18, 2025

Verified Purchase

Erik B.