Series 50 Ball Bearing And High Load Blocks Series 50 Single Block, 1100 Swl Series 50 blocks are typically used on boats up to 33 for main and spinnaker sheets, halyards, and other primary applications. Standard ball bearings are made of Acetal High load versions have a self lubricating Nylatron174 sheave suitable for rope or wire with Torlon ball bearings Light weight with removable becket pins Captive lock universal head fitting can be fixed at 0, 90, or free to swival 360 Cheek cut outs for easy bearing maintenance Sheave diameter 2 50mm Max. wire diameter 316
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