Yacht Sailboat 57mm 2 1/4 inch Triple Swivel Shackle Fairlead Cleat Block Master BB-0512F Master Windrider blocks are engineered for competitive sailing. The high strength composite sideplates are to provide top performance of working loads. The excellent weather-ability protects blocks from breaking down for any sailing conditions. Available in comprehensive range of sizes for different rope diameters and configurations. Master blocks are beautiful in design, but simple in use. Ultra Lightweight Master set a new standard of lightweight to blocks. With extremely lightweight, Master block are the best choice for racers. Stronger Strength Engineering composite is stronger and lighter than classic stainless steel blocks. Low Friction Ball Bearing The exclusive engineering plastic composites ball bearing provides sheave with good rotation and less friction. Master Windrider 57mm blocks are specially designed for high-load and dynamic application. Available in comprehensive range of sizes for different rope diameters. An exclusive Face to Face locker system can be easily engaged to position shacke in either of two directions or just free to swivel. A locker system also can take more loads then traditional ways without damaging the block and hassle. Patent pending in Australia, US, UK, France, Netherlands, China, Germany, and Taiwan. US, Taiwan, China Design Patent. Specification: Brand: Master Part Number: BB-0512F Sheave Ø (mm) 57 mm Sheave Ø (in) 2 1/4 in Length (mm) 122 mm Length (in) 4 4/5 in Weight (g) 348 g Weight (oz) 12.28 oz Maximum line Ø (mm) 10 mm Maximum line Ø (in) 3/8 in Safety working load (kg) 100 kg Safety working load (lb) 220 lb Breaking load (kg) 200 kg Breaking load (lb) 440 lb •Do not use Master products to human suspension! Destination custom duty/tax are not included in the listing price; it is the customer's responsibility to pay for custom duty if any.