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Ronstan Series 40 Ball Bearing Blocks feature compact design and exceptionally high working loads that make them ideal for mainsheet, halyard, vang, and spinnaker control applications on boats such as off-the-beach catamarans, one design classes and sports boats up to 26 Ft. (8 Meters). Also suitable for control lines on larger boats.
Materials: acetal ball bearings, uv stabilized acetal sheaves, uv stabilized zytel cheeks, and 316 stainless steel load straps and head fittings. Sheave dia. 1-9/16" (40mm) Max. rope 3/8" (10mm) Pin 3/16" (5mm)