Polyspastny seam

A pulley seam is a type of seam used in construction to strengthen structures and connect them. It is a round element made of stainless steel, which is welded to the parts of the structure and allows you to increase its strength by tensioning the cable or wire inside it. The seam has the shape of a ring, in the center of which the axis of rotation of the pulley is located. From this type of seams