Harken's 29mm Pivoting Lead Block, featuring Carbo-Cam® cleat Part No. 396, is ideal for halyard controls on large keelboats and as "head knockers" on dinghies and beachcats. This high-strength block has a 29mm sheave diameter (1 1/8 inches) and can accommodate a maximum line diameter of 6mm (1/4 inch). With a maximum working load of 68kg (150lb), this versatile block has a cam that can be reversed for both up and down cleating. Additionally, its hole spacing and rivet size are compatible with Classic models, making upgrades a breeze. As an added bonus, it can also be used as a becket block.