Type: Nylon sucker rod centralizer, anti- partial-wear sucker rod centralizer, roller type sucker rod centralizer Size: 5/8", 3/4", 7/8", 1", 1-1/8" Ucker rod centralizer used in pumping well, it's a tool which can set upright the sucker rod, and protect the sucker rod wiping with tubing pipe, we can product wheel centralizer, rod shaped centralizer, twist centralizer. Operational principle: 1. Wheel centralizer: When the sucker rod works the wheel rolls on tubing inside. It can avoid the sucker rod to rub with the tubing pipe. 2. Rod shaped centralizer: When the sucker rods work, nylon block touches the tubing inside, it can avoid the sucker rod to rub with the tubing pipe. The nylon block can rotate, then the rub is even wear. The user only change the nylon block replace rod body, can save fabrication-cost. 3. Twist centralizer: Cost of it is low, operate easily.