Designed for bringing control lines over the forward edge of cabin houses, coamings or rails. Ball bearing sheaves provide low friction support for lines that need to be bridged or lifted for a clean lead. Open race ball bearings allow salt, dirt and debris to be easily flushed out. Single blocks. Maximum line dia: 1/2". Use #10 fasteners. Configuration: Over-the-top lead block Ball Bearings: Delrin Cheek Material/Finish: Polished stainless