The STM hooks are specially used in irrigation systems on vineyards and orchards. They support the microsprinkler and allow to correct its position on the pipe when it twists due to temperature variations (hot/cold). Notice that a microsprinkler grafted directly in the pipe, due to the tube twisting, would water the leaves and the fruits, causing damage. This system is particularly suitable for irrigation systems in vineyards with mechanical harvesting, since it does not interfere with the working harvester.