Ronstan RF28100 Series 25 Ball Bearing Block

Ronstan Series 25 Ball Bearing Orbit Block

The Series 25 Ball Bearing Orbit Block is a single sheave block designed for optimal performance in competitive sailing. Featuring a becket hub and swivel shackle head, it provides superior strength while being lightweight, making it ideal for high-demand applications on dinghies and small boats.

Engineered with Ronstan's high compression strength acetal bearing system, this block achieves an exceptional strength-to-weight ratio, ensuring it performs reliably under demanding conditions. Perfect for control line systems, such as mainsheets and spinnaker sheets, as well as cunninghams and cascading vangs for dinghies up to 4 meters.

Each block is fitted with a stainless steel hub compatible with 4mm (5/32") lashing for versatile setups, ensuring maximum efficiency in rigging and operation.