These are the little turning blocks that are used at the base of the mast to turn the cunningham and outhaul lines back to the 2 cam cleats. These are used on the new boats with the performance line upgrade. These fit the Maffioli Swiftcord we have on our Line page. Sheave dia. (in) 5/8 Length (in) 1-5/32 Weight (oz) 3/8 Max. line dia. (in) 7/32 SWL (lb) 250 Breaking strength (lb) 1200 Availability: Usually ships the next business day. 376Regular price: $17.05Sale price: $14.49 Due to the wide variety of the size and weight of our items we will charge the actual cost of shipping in a separate charge on all orders. Please email us for a shipping cost estimate. Shipments outside the USA may have add on fees and duties by your own government. Sailing can be green! See our recycle your old sail offer Send us email