Casing centralizer is used to protect the sucker rod and reduce wear.
2.1.Super strong spring steel
2.2. ASTM A395 ductile iron, or equivalent international serial number.
2.3.Polyester centralizer
2.4.Aluminum alloy
3.1. One bow or two bows without welding
3.2. Rigid type
3.3.Roller type
4" x 5-7/8", 4-1/2" x 6-1/8", 5" x 61/2", 5-1/2" x 8-1/2", 7" x 8 -1/2 inch, 7-5/8 inch × 9-1/2 inch, 8-5/8 inch × 10-5/8 inch, 9-5/8 inch × 12-1/4 inch, 10-3/4 inches × 14-3/4 inches, 13-3/8 inches × 17-1/2 inches, 16 inches × 20 inches, 20 inches × 26 inches