For leading lines aft and over cabin tops or coamings. Narrow sheave carriers permit mounting several in a small area. Low lead profile keeps lines close to the deck. Standard block features a stainless shell, Delrin sheaves and roller bearings. High-load blocks have aluminum sheaves with ball bearings and Teflon-composite bushings designed to carry the high static loads of halyards. Sheave: 1-3/4" Ball Bearings: Standard: Delrin; Hi-Load: carbon-black bushings Sheave Size: 1986: 1-3/4" (44mm); 1988 & 3002: 2-1/4" (57mm) Line Diameter: 3/8" max. Cheek Material/Finish: Standard: Polished stainless; Hi-Load: anodized aluminum