SeaSure 25mm Double Block w/Shackle

The SeaSure 25mm Double Block with Shackle is a professional-grade rigging solution built for serious boaters, sailors, and marine enthusiasts who demand reliability under load. Whether you're managing halyards, controlling sails, or setting up a complex pulley system on deck, this marine block delivers the mechanical advantage and durability needed for years of trouble-free service. It's the choice of experienced crew who understand that quality hardware directly impacts safety and performance on the water.

This model features marine-grade stainless steel side plates and rivets paired with an arnite (reinforced plastic) sheave—a proven engineering combination that balances strength with minimal weight. The arnite sheave is exceptionally hard-wearing, resisting corrosion and salt-spray degradation while maintaining smooth load transfer with reduced friction. At just 1 pound, the 25mm block won't burden your rigging system, yet the plain bearing design provides reliable performance across the full spectrum of boating conditions, from coastal cruising to offshore work.

The integrated shackle makes installation straightforward on rails, posts, or existing fittings, eliminating the need for additional hardware. Anglers towing tackle, cruising sailors managing multiple sheets, and commercial boat operators will appreciate the proven track record of SeaSure's 25mm plain bearing block range—one of their longest-selling and most trusted product lines. This is marine-grade equipment for those who won't compromise on quality or dependability.