Lehigh 7402-6 2-Piece 6 inch Swing Hardware Set Measures 6.4-Inch (L) by 3.1-Inch (W) by 1.9-Inch (H) Rigid design provides maximum strength and the movable parts will not rust or freeze Yellow-chromate finish defends against water, food and chemical corrosion Ideal for hanging a swing on a wooden frame 150-Pound safe working load The physical dimension of the hook is 6.4 inch because you screw the threaded top to anchor the swing making the hardware 6 inch after installation.