Series 30 Utility Ball Bearing Block - Single, Becket, Swivel Shackle HeadFeatures:Low friction 2-stage ball bearing system provides consistent performance over the full working load range.High static and dynamic load capacity.Light weightVersatile head fittingsCheek cut-outs for easy bearing maintenanceProduct Information: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:Primary lead blocks on dinghies and catamaransControl lines on larger yachtsMaterials:U.V. stabilized Acetal sheavesAcetal ball bearingsImpact modified, fiber reinforced and U.V. stabilized Nylon cheeksGrade 316 stainless steel load straps and head fittings