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Ronstan's Series 50mm Ball Bearing Blocks' sheaves run on Acetal or Torlon ball bearings and provide high performance and low friction. The two-stage ball bearing system provides consistent performance over the full load range.
Ronstan's Captive Lock universal head can be fixed in either of two planes, or set to swivel freely.
They are used in mainsheet, spinnaker sheet, halyard and other primary applications on boats up to 33 feet (10m).
Make sure you have a spare RF150 (a 3/16 in. diameter standard Dee shackle with a slotted pin.
