Ronstan RF15151 15mm Single Cheek Block – Series 15 Pulley NZThe Ronstan RF15151 Series 15 Single Cheek Block is a compact, high performance pulley designed for fixed mounting and efficient line redirection on dinghies, trailer yachts, and small keelboats. Its dual mounting holes provide superior stability, making it ideal for deck, mast, and boom installations. Built with a 15mm UV stabilised acetal sheave running on stainless steel ball bearings, the RF15151 delivers exceptionally smooth, low friction

Perfect for both cruising and competitive sailors

and offshore sailors who demand strength and durability

Ideal for rod holders

and composite work

keep correct polarity

while remaining lightweight and easy to install

making it easy to integrate into custom sail handling configurations

Unlike traditional metal hinges

Side-mount (cheek block) design for fixed applications

Large numerals and digits

and marine professionals throughout New Zealand

Displays both apparent and true wind speed and direction