Made of high quality aluminum with cast nylon pulley. It will fit 2" maximum outside diameter flagpole tube. Flag pole pulley accepts a maximum halyard diameter of 5/16". They are durable and rust proof, you will be able to use it for a long time. Flag Pole Rope: The white flag rope measures 50 feet length by 6mm(1/4") diameter, made of solid polyester braided rope, resistant to UV & abrasion, suitable for flagpoles up to 25 feet.