Sea Sure 00.21CRD 25mm Double Block with Shackle

The Sea Sure 25mm Double Block with Shackle is part of one of the brand's oldest and best-selling block ranges, designed for reliable marine rigging applications on sailboats and other vessels. This block features marine-grade stainless steel side plates and rivets paired with an arnite (plastic) sheave that delivers exceptional durability while remaining lightweight.

Key Features:

• 25mm plain bearing block design for dependable performance
• Marine-grade 316 stainless steel construction for corrosion resistance
• Arnite plastic sheave offers superior wear resistance and low weight
• Integrated shackle attachment for quick and secure connection
• Double sheave configuration for versatile rigging options

This versatile block can be used to create purchase systems for lifting, garage door mechanisms, storage solutions, and more. The 00.21 model enables creation of a 4:1 purchase system to aid in lifting heavier objects and decrease the load on the rope. Ideal for control lines, halyards, and general-purpose marine rigging applications.