Marine Boat Yacht Sailboat Dinghy 57mm 2 1/4 Inch Upright Lead Block Small Boat Block Master HL-0501F Master Upright Lead Blocks are one piece CNC machined black Hardcoat-Anodized aluminum cheek to provide excellent strengh and lightweight. All sheaves are 6061-T6 Black Hardcoat-anodized Aluminum for extra strength, smooth rotation, and long-term durability. The Upright Lead Block can be be configured in a group at the Mastbase. Specification: Brand: Master Part Number: HL-0501F Sheave Ø (mm) 57mm Sheave Ø (in) 2 1/4 in Length (mm) 78mm Length (in) 3.07 in Weight (g) 150 g Weight (oz) 5.29 oz Maximum line Ø (mm) 10 mm Maximum line Ø (in) 3/8 in Maximum working load (kg)1200 kg Maximum working load (lb) 2640 lb Breaking load (kg) 2500 kg Breaking load (lb) 5500 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.