High Quality Material plant hook is made of strong nylon rope, stainless steel hook and high quality plastic shell.It is very durable and hangs well on your flower pot.The plant hook and nylon rope is strong enough to hold a 10kg 22lb(Maximum) weight plant or flower basket, no worry about the fastness.The Plant hooks pulley working priciple is in the opposite way to the seat belt. There is about 8 position. Each position is about 10 cm apart. The rope must be pulled slowly to get stuck in position.When you pull the rope quickly, you will always pull the rope to the end( the rope won't stop in the height which you want to).