The 30mm Allenite Through Deck from Allen offers smooth guidance for controlling ropes and wires that pass through surfaces or decks. Its durable acetal body is designed to perfectly accommodate the sheave, ensuring dependable performance for adjustable rigging and heavy-duty applications. These Dynamic Blocks utilize a patented twin stainless-steel ball bearing system on a stainless-steel rail, providing exceptional load-carrying capacity and longevity compared to other systems that use a plastic rail.