The Allen 16mm X 13mm X 8mm Deep Acetal Deck Bush, also called a through deck fairlead or bush, rope guide, and thru-deck bush, is designed to efficiently guide a rope or wire through a surface while protecting both the rope and the surface from wear. To install, drill a hole to match the external diameter of the bush, apply a bonding agent, and push the bush into place. This injection-molded, lightweight, and budget-friendly option is ideal for most uses, but if you plan to have a fast-running control line, we recommend considering one of our other material options for added durability.