IH-1-3IH 1 3 Flagpole Truck Internal Halyard (Cap Style) The IH 1 3 is a stationary, cap style flagpole truck designed for internal halyard flagpoles with a 3" top diameter. Crafted from durable cast aluminum, this truck features a single internal pulley system that ensures smooth flag operation. Key Features: Construction: High quality cast aluminum for strength and longevity. Internal Pulley: 1 1 2" outside diameter cast nylon pulley mounted on a 1 4"