Marine Boat Yacht Sailboat Hardware 40mm 1 9/16 inch Single Fiddle Swivel Shackle Block Small Boat Block Master BB-0419F 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. The 40mm blocks are available in a wide range of configurations. They are lighter, stronger and better than classic blocks. US, Taiwan, China Design Patent. Specification: Brand: Master Part Number: BB-0419F Sheave Ø (mm) 40 mm Sheave Ø (in) 1 9/16 in Weight (g) 59 g Weight (oz) 2.08 oz Maximum line Ø (mm) 10 mm Maximum line Ø (in) 3/8 in Safety working load (kg) 230 kg Safety working load (lb) 506 lb Breaking load (kg) 800 kg Breaking load (lb) 1760 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.