Harken 25mm Thru-Deck High-Strength Block allows lines through the deck and bulkhead.
Harken's Lightweight, low-friction blocks with high-load composite bearings carry wire halyards and control line cascades. Side-load balls reduce friction from twists or unfair leads on 304-311. 300-303 has thrust washers. Blocks open to allow passage of swaged wire. Hard Lube-anodized sheave for strength and corrosion resistance. Cheek blocks include fasteners.
Wire blocks are low friction designed to carry wire halyards and control lines. The polished stainless steel side plates are light and strong. They offer superb chafe resistance with wire halyards and controls.