The Harken Three 29 mm Carbo Blocks on Ring (HSB555) is a lightweight, high-performance rigging assembly featuring three small 29 mm Carbo AirBlocks® mounted together on a stainless-steel ring for multi-lead applications. These Carbo blocks combine lightweight composite construction with low-friction ball bearings, making them ideal for redirecting control lines, barber haulers, or fine-tune systems where multiple sheaves in a compact cluster are needed. The ring-mounted design lets you lead multiple runs through a single point securely and efficiently, reducing weight and friction without compromising strength — perfect for performance dinghies and small keelboats alike.
