Single-sheave design, made from Tufnol, with large sheave diameter. These blocks are maintenance-free and known for their long lives. The sheaves are finished with brass bearings, greatly reducing wear and friction. They are particularly well suited for backstay purchase systems.
The high breaking loads have been tested by Germanischen Lloyd (GL). The maximum working load specified by the manufacturer is 50% of the breaking load (BRL).
These blocks are particularly good for classic yachts of the 50s and 60s.
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