Single Adjustable Clamp On Deck Hook hanger is 42" overall maximum height and has an extended reach of 17" reach. This Bird feeder and plant hanger features plastic sleeve within the tube that travels up and down the shaft. This insures effortless positioning of the arm - without scratching the finish. A thumb screw locks the arms in place. Each piece is painted with a baked on powder coated finish that will look great for years. Nickel plated brass end caps give this piece a contemporary appearance. This deck hanger easily holds 10# bird feeders or flower baskets. The large turning knob allows for effortless clamping to your deck rail. The clamp accommodates rails up to 3-1/2" Thick. Made in the USA!