Ronstan Series 50 Single Universal Head BB Block

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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 . Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required.Applications Mainsheet Spinnaker sheets Halyards and other primary applications on boats up to 10m (33ft) Show more