SeaSure 25mm Treble Block w/Center Becket

The SeaSure 25mm Treble Block w/Center Becket is a foundational rigging component trusted by serious boaters, sailors, and commercial mariners for decades. This stainless steel block serves as a load-bearing pulley system, ideal for mainsheet setups, halyards, and deck hardware on vessels ranging from day cruisers to offshore racing sailboats. The center becket mounting point allows for versatile attachment configurations, making it an essential addition to any marine rigging arsenal where reliability and mechanical advantage are non-negotiable.

Built with marine-grade stainless steel side plates and corrosion-resistant rivets, the SeaSure 25mm block delivers durability in harsh saltwater and freshwater environments alike. The arnite plastic sheave is engineered to be remarkably hard-wearing and lightweight, reducing weight aloft while maintaining superior load distribution under tension. This combination of materials—proven through SeaSure's long production history—minimizes friction losses in your rigging system, lowering crew effort when hoisting sails or managing running gear. The 25mm size strikes an optimal balance between load capacity and practical deck space, fitting seamlessly into standard marine hardware layouts.

Cruising sailors and race crews benefit most from this block's reliability and longevity, particularly in high-use applications like mainsail control and jib rigging. The center becket configuration is ideal for systems requiring a single fixed attachment point with multiple line paths, or for blocks that need to serve dual hauling roles. Installation is straightforward—secure the becket via stainless fasteners to your boom, rail, or mast step, then run your line through the sheave. Whether you're upgrading tired hardware or outfitting a new vessel, the SeaSure 25mm Treble Block w/Center Becket delivers time-tested marine engineering at a practical price point.