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When you use a ladder to hang things and fix it against a cylindrical object, such as a telephone pole, under this situation, it is not safe enough for there is only one pivot between the ladder and the telephone pole.However, the situation will reform with usage of this semi-circular groove, which can have a perfect connection with the telephone pole and its inside rubber could absorb the shock and increase friction force. Apart from increased safety, it does not need person to help to hold the ladder. And it can rotate as whole and save space. The pedal is designed as wave-shaped to increase friction and play a non-slip function.