Ronstan RF15100 15mm Single Swivel Block – Series 15 Pulley NZThe Ronstan RF15100 Series 15 Single Swivel Block is one of the smallest and lightest high performance sailing pulleys available, designed for applications where low friction, minimal weight, and efficiency are critical. Featuring a 15mm precision moulded acetal sheave running on stainless steel ball bearings, it delivers exceptionally smooth operation for fine control systems. Built with UV stabilised acetal components and 316 stainless steel cheeks,

this piece is a must-have for Kiwi mariners

industrial signaling

boom fittings

and long-lasting cold storage in tough outdoor conditions

wear-resistant marine nylon construction

Whether you're cruising coastal waters or heading offshore

Ronstan RF51510 – 50mm fiddle block with integrated becket

2 x sterile non adhesive dry dressings

4 gallons/minute) open flow

Waterproof & weather-resistant – ideal for marine environments

easy to install

this block is engineered to handle high static and dynamic loads while remaining lightweight and corrosion-resistant