Hanging hooks are an essential accessory for fruit and vegetable growing in professional greenhouse horticulture. When growing new seedlings, the hooks are hung on the crop wire in the greenhouse. Young plants are strung on the hooks to support their growth. Hooks are used to string tomato plants, particularly in tomato production. The use of high wire hooks makes it easier to work at the right height by lowering the plants. The hooks must have a sufficient steel thickness to enable the hook to support the weight of the plant. In addition, the free fall of the wire strung on it is an important element to consider. In addition to free fall and steel thickness, the thickness of the line, the length of the line and the colour of the line are also important factors.