This little block is used for the "dingleberrys" (the 2 turning blocks on the mast for the outhaul) and can also be used at the clew of the sail either on a clew hook or a shackle. These are the same Harken blocks that come with the boat when new. These fit the Maffioli Swiftcord we have on our Line page. Sheave dia. (in) 7/8 Length (in) 1-1/2 Weight (oz) 1/2 Max. line dia. (in) 1/4 SWL (lb) 200 Breaking strength (lb) 1200 224Price: $15.55Sale price: $13.95 WE SHIP WORLDWIDE! We charge the actual cost of shipping. You may email us for a shipping cost estimate. Send us email intensitysails(at sign)gmail.com US$10 MINIMUM ORDER