What is the function of sucker rod centralizer?

The sucker rod moves up and down in the tubing. Due to the elastic deformation of the sucker rod, the rod and the tubing wall are easily to friction, and the sucker rod is easy to break off. But with the sucker rod centralizer, it is a high-strength wear-resistant material, and it is worn and straightened by contact with the tubing. It can reduce the abrasion of the tubing to achieve the purpose of preventing partial wear. So that the it can enhance the oil recovery life of the pumping unit.