The Allen 16mm X 13mm X 8mm Acetal Deck Bush Black is a versatile tool also known as a through deck fairlead or bush, rope guide and thru-deck bush. Designed to take up minimal space, it guides ropes or wires through surfaces, protecting them from wear. To install, simply match the bush's external diameter with a drilled hole and secure it with a bonding agent. While this injection moulded product is lightweight and cost-effective, it is not as durable as other material options for fast-running control lines.