Heavy duty - Our flagpole trucks are made of high quality aluminum with cast nylon pulley. They are durable and rust proof, you will be able to use it for a long time! Fit all standard flagpoles - Truck is secured to pole with 3 stainless inset screws. Designed to mount any flagpole that diameter ranges from 1.5" to 2". Durable pulley - The pulley is made of nylon and accepts 1/4" or maximum 5/16" diameter halyard rope. Fit standard top ornament -The threaded spindle for the topper ornament is 0.5"-13 NC (M12x1.75), suitable for all standard US flagpole topper. Commitment - We stand behind our products! Please feel free to contact us if you have any questions or concerns.