The Allen 30mm Plain Bearing 3 Sheave Deck Organiser is the ultimate tool for leading control lines and halyards along a deck or coach roof. Made with marine-grade aluminium cheeks and anodised black for durability. The PB stands for Plain Bearing, meaning the sheave runs on a central stainless steel bush, perfect for high static loads. Easily stackable to create a double-height deck organiser.