RONSTAN SERIES 40 BALL BEARING BLOCK- SINGLE UPRIGHT LEADSeries 40 Ball Bearing Block - Single Upright LeadLead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Precision molded Acetal 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.
 Applications: Typically used for halyards at the mast base.
 Materials: Acetal ball bearingsUV stabilized Acetal sheaveGrade 316 stainless steel load housing