Use Carbo lead blocks for safe furling from the cockpit.The 7404 kits lightweight, UV-stabilized Carbo blocks run exclusively on ball bearings for fast trimming under any load. It provides a complete system for most boats.These stanchion lead blocks have free-rolling ball bearings to lead line aft for safe furling from the cockpit.Use the 7401 40 mm block on the bow pulpit as an inboard lead.The 7402 features a ratchet to control spooling when unfurling.The 7401 and 7402 have ball and socket bases to align blocks for smooth leads aft.The 7403 has a 29 mm sheave and allows the furling line to travel outboard of the stanchion to keep the side deck clearMounts to stanchion with a four-screw clamp