The Fly Block 40mm Single #2173 is a robust and efficient harken block perfect for maximizing power with minimal weight. It's specially designed for modern sailing needs with high-tech lines, offering impressive load capacity relative to its size. Ideal for those who love the agility and speed of foiling dinghies and sportboats. Benefits High load capacity for its compact size Lightweight design for low aerodynamic drag Durable construction with titanium and stainless steel components This harken block features a titanium outer race and sheave, stainless steel ball bearings and inner race, along with composite fiber-reinforced sideplates. The block measures 40 mm, making it compact yet powerful for a range of sailing applications. It's specifically engineered for advanced sailing setups, providing seamless compatibility with high-tech lines. Please note that the lashing line is not included. Usage Perfect for use on foiling dinghies, sportboats, and in vang cascades or backstay systems on Grand-Prix racers.