Twist in ground socket with 20" in ground has a set screw and 1/2" turning holes. Allows 1" diameter poles to have full height above ground. Starting at the ground level, you will need a secure position to begin your pole mounting. The way we recommend it is by utilizing a ground screw. This screw is easily twisted 20” into the ground using the handy ½” turning holes, providing a stable foundation for your future pole system.