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Ronstan Series 40 All Purpose Blocks are typically used for mainsheet, halyard, vang, and spinnaker sheets on boats up to 26 ft. (8 meters) as well as general service applications on larger boats.
Smart features include: exceptionally high working loads, low maintenance, removable becket pins, Captive Lock universal head fitting, quick adjusting cleat arms. UV stabilized Acetal sheaves provide bearing performance on a polished stainless steel race.
Materials: Zytel cheeks. and 316 stainless steel load straps and head fittings. Sheave Dia.: 1-9/16 (40MM) Pin Dia.: 3/16" (5mm)