Ronstan Series 30 Utility Block - Double, Tube Rivet

The Ronstan Series 30 Utility Block – Double, Tube Rivet is a compact, dual-sheave rigging block built for sailors, boaters, and anglers who demand reliable load management without excess weight or maintenance hassle. Whether you're managing sails, anchor systems, or fishing tackle rigging, this double block serves as the backbone of efficient deck hardware. Its economical design makes it accessible for both professional mariners and recreational boaters upgrading their rigging systems.

Constructed with stainless steel cheeks and Acetal sheaves, the Ronstan Series 30 Utility Block delivers corrosion resistance and durability in harsh saltwater and freshwater environments. The tube rivet fastening method ensures a secure, maintenance-free assembly that won't loosen under the cyclic loading typical of marine applications. Acetal sheaves offer low friction performance and self-lubricating properties, eliminating the need for regular greasing or servicing—a critical advantage when you're offshore or in remote anchorages where maintenance access is limited.

This block excels in applications requiring simple, dependable line management: mainsail reefing systems, jib sheet control, anchor rigging, and multipurpose deck tackle. The lightweight 0.12 lb frame and compact 2 × 1 × 3 inch dimensions make it ideal for cruising sailboats, fishing vessels, and utility boats where weight and space conservation matter. Its double-block configuration provides mechanical advantage for systems where load reduction and controlled line travel improve handling and crew fatigue during extended passages or fishing operations.