Watertight construction & all parts fully UV treated

Heavy duty black polypropylene construction suitable for wet exhaust systems only

Low elongation

Suitable for all non-silicone-sensitive gelcoat surfaces

The Allen Stanchion mounted blocks

Harken 29 mm Zircon Block 2185 boating Watertight construction & all partsThe newest Zircon offerings are six models with 29 mm sheave diameters. These expand the Zircon offering from eight models to eighteen. Zircon is not an all purpose alternativeno block is. But these smaller sizes make Zircon appropriate for control lines where multi part purchases are required. Zircon reacts immediately. So, when the pressure gets light and you ease that 24: 1 Cunningham rigged under the deck or want to let the jib lead forward for