Core Blocks™ are a true all round solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing.

Applications:
Ideal for use on mainsheet, spinnaker sheet, vang, halyard and backstay applications on boats up to 14 m (46 ft), general applications on larger yachts, alloy sheave models are available for use with wire.

Our Part # RONRF74108 | Ronstan Part # RF74108

Features:

• Class leading performance and sleek, contemporary styling.
• Excellent dynamic and high static load performance.
• Less than half the friction of the nearest competitor.
• Suits direct attachment to mainsail headboard for 2:1 halyard.
• Removable 8mm (5/16 in) screw pin at head.
• Acetal roller on head pin to suit spliced line attachment.
• Alloy Rope/Wire sheave version also available.
• Central hub hole can be used as a becket take-off or tie-up point.