Ronstan RF64520 Series 60 Core Fiddle Block with Cleat – 60mmThe Ronstan RF64520 Series 60 Core Fiddle Block with Cleat is engineered for high performance sailing applications, offering exceptional strength to weight ratio. Featuring a 60mm primary sheave and a 30mm secondary sheave, this block accommodates rope diameters up to 12mm. Its 2 stage bearing system ensures low friction and high load capacity, with a maximum working load of 525kg and a breaking load of 2000kg. The adjustable cleating angle and

DigiGear tech – precision-machined gears (~20‑40% larger) for enhanced efficiency and longevity

Ideal for supporting hatches

When added to enamel

CO₂ Cylinder Size: 33 grams

high-load rigging

sizing up may improve comfort for longer sessions

Designed to withstand marine environments

especially where space is limited or smoother bends are required

while still allowing quick and easy access to your gear

installing stainless-steel winches can pose a serious risk due to electrolysis

Triple 15mm sheaves for maximum purchase and load distribution

it features high-density polyurethane insulation