Designed for centering the ends of individual pipes and sections when assembling fixed and rotary joints during pipeline construction. It is used where the use of external centralizers is impossible. Allows you to continuously weld and use welding machines. The mechanism for spreading the inner guides that aligns the pipe joint is a mechanical device. The pressure created on the inner wall of the pipes is transmitted from the operator using a hand drive. Used where it is not possible to use an air or hydraulic power source.