Ronstan Ball Bearing Car - Series 22 - Headboard fenders Core Blocks™ incorporate a full

Core Blocks™ incorporate a full contact acetal bearing on a polished stainless steel race to maintain low friction performance under heavy loads

These blocks have been designed primarily for attachment around the mast collar to lead halyards aft from the mast base to winches

compact design for durability and simplicity

very easy DIY installation

Suitable for 12 and 24 volt

Ronstan Ball Bearing Car - Series 22 - Headboard fenders Core Blocks™ incorporate a fullSailing professionals around the world choose Ronstan batten systems for superior and innovative features combined with race proven performance and reliability. Low profile Lightweight alloy car bodies With 7 track sizes in the standard product range, there is a system with the right specifications for every boat and sail plan. The range includes all elements for a complete system, including headboard plates and batten receptacles. Easy track