The Harken 29 mm Carbo Outboard Lead Block Assembly is used on a bow pulpit as an outboard lead and it allows the furling line to travel outboard of the stanchion to keep the side deck clear. Harken® recommends equipping every system with Carbo lead blocks for safe furling from the cockpit. Block mounts with a strong four-screw clamp without removing the stanchion or lifelines.