The Harken 40 mm Zircon Triple Block, part number 2194, boasts a maximum working load of 345 kg (750 lbs), with a maximum line diameter of 8 mm (5/16 in) and a sheave diameter of 40 mm (1 9/16 in). Thanks to the use of industrial ceramic ball bearings mounted in caged races, Zircon blocks offer immediate and efficient sail shape adjustments to varying conditions. Available in both single and double blocks, with or without beckets, with sheave sizes of 40 and 57 mm, these blocks are the pinnacle of small boat performance and are a testament to Harken's expertise in the industry.