The exterior acts as a magnetic force line corridor from North Pole to South Pole, comprehensive, and based on other components, strong and made of cast iron or steel sheet thickness, roll into a cylindrical shape.
This project serves as a walkway outside of the lines of magnetic force from the north pole to the south pole, providing a comprehensive and strong hold other components made of cast iron or steel plate and roll into a cylinder.
External structure serves as a passage of the magnetic lines of force from the north pole to the south pole to comprehensive and based on other components to a cast-iron or steel plate roll into a cylinder.