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Schaefer 7 Series Fiddle Blocks are constructed with a large diameter single sheave and dual in-line sheaves with the ability to spread oversized line over a greater surface. This high load design offers the ability to withstand the shock loads associated with Mainsheet and Boom Vang Systems. This powerful configuration prevents sailboat sheets from crossing and chafing and distributes load to three axles instead of the two seen in other block designs. Delrin™ or Delrin™ Ball Bearing sheave design are offered with either high luster Stainless Steel or Hardcoat Anodized Aluminum cheeks. All of the 7 Series Schaefer Fiddle Blocks work with Schaefer's Universal Adapters. Spread the load and get control of your main. Cheeks are constructed of tumbled and polished Stainless Steel or Hardcoat Anodized Aluminum for maximum corrosion resistance and strength. Sheaves are made of high impact Delrin™ or Delrin™ running on Delrin™ Ball Bearings.