Ronstan RF20281 Series 20 Bb Block – Double In-line

Series 20 Ronstan’s Ball Bearing (BB) Blocks are a great all around solution. Ball Bearing blocks have been conceived and engeered for the demands of competative sailing. Used on boats of all sizes for sheet, fine tune and control line applications. They utilise a highely efficient, low friction bearing system for optimim sheeting and trimming performance.

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