Harken HSB380 57mm Quad Block Swivel with Center Becket

The Harken HSB380 is a 57mm quad block featuring a swivel base and center becket, designed for high-performance sailboat rigging applications. Part of Harken's Carbo Air block series, this compact yet robust block combines low-friction performance with exceptional strength-to-weight ratio, making it ideal for control lines, mainsheet systems, and other demanding applications on cruising and racing sailboats.

Key Features:

• 57mm (2 1/4") diameter sheave for smooth line movement and reduced friction
• Quad sheave configuration provides 4:1 mechanical advantage for powerful trimming
• Swivel base allows the block to rotate freely, reducing line twist and wear
• Center becket attachment point for versatile rigging configurations
• Carbo Air construction delivers lightweight strength with reliable performance
• Accommodates lines up to 10mm (7/16") diameter
• Impressive 1080kg (2380 lb) maximum working load capacity

Harken's Carbo Air blocks are engineered as affordable companions to their Big Boat block line, offering sailors professional-grade performance without compromising on quality. The low-friction sheaves ensure easy line handling and efficient sail trimming, while the compact design saves valuable space on deck and in rigging systems.