1.Material: high quality carbon steel or alloy steel.
2.The specification of sucker rod coupling: 5/8″, 3/4″, 7/8″, 1″, 1-1/8″.
3.Grade: T and SM.
4.Type: sucker rod coupling, polished coupling and sub-coupling.
5.Package:to keep the product in good condition,we use wooden cases to make pack them.