Ronstan Series 40 Ball Bearing Block - Single Upright Lead [RF40171] Marine Navigation & Instruments | GPS - Track Plotter Each instrument comes with a

Each instrument comes with a low-profile surface mounting kit and silicone rubber sun cover

Unique stainless steel shaft with bushing and twin Nitrile “O” rings for greater protection against water penetration

Box Dimensions: 7"H x 14"W x 16"L WT: 7

60" Black PVC Post Guide-On

Reverse Polarity Protected

Ronstan Series 40 Ball Bearing Block - Single Upright Lead [RF40171] Marine Navigation & Instruments | GPS - Track Plotter Each instrument comes with aSeries 40 Ball Bearing Block Single Upright Lead Lead 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