Series 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 bearings; UV stabilized Acetal sheave; Grade 316 stainless steel load housing; - cis2:mm5mnJlm -