The Ronstan RF187 Series 30 Fiddle Block with V-Jam Cleat is a lightweight, high-performance sailing block designed for efficient line handling and secure cleating in one compact unit. Featuring a dual-sheave (fiddle) configuration and integrated V-jam cleat, this block is ideal for control line systems where quick adjustment and holding power are essential.

Built with UV-stabilised acetal sheaves and 316 stainless steel cheeks, the RF187 delivers smooth operation, durability, and minimal maintenance even in harsh New Zealand marine conditions. The tube rivet head design allows flexible attachment using screws, shackles, or as a becket for added purchase.

Perfect for dinghies, trailer yachts, and small keelboats, this versatile block is commonly used in vang, cunningham, and trapeze retriever systems, as well as leech line tackles and onboard adjustments.

Key Features

• Fiddle block design (29mm + 40mm sheaves) for increased purchase
• Integrated V-jam cleat for fast, secure line control
• 316 stainless steel cheeks for corrosion resistance
• UV-stabilised acetal sheaves for smooth, low-friction performance
• Tube rivet head allows versatile mounting or becket use
• Lightweight, durable, and maintenance-free design
• Ideal for dinghy and small yacht control systems

Specifications

• Sheave Sizes: 29mm & 40mm
• Max Rope Diameter: 8mm
• Maximum Working Load: 300kg
• Breaking Load: 600kg
• Weight: Approx. 60g
• Materials: 316 Stainless Steel cheeks, Acetal sheaves

Why Choose the Ronstan RF187? 

For New Zealand sailors, efficiency and reliability are key when managing control lines. The RF187 combines block and cleat functionality in one unit, reducing deck clutter and improving handling speed.

Its durable, corrosion-resistant construction ensures long-term performance in coastal and offshore environments, making it an excellent choice for both recreational sailors and competitive racers.