Place of Origin : Heyuan,China
Delivery Terms : FOB
Product Capacity : 5000 Pieces Per Year
Payment Terms : 30%TT AND 70%L/C

Drill collars we produce is made from 4145H forging or rolling modified steel. All connections are phosphate-coated to improve resistance to corrosion. We offer slip groove, elevator groove to improve handling efficiency and safety.
Different sizes we produce is from 3 1/2" to 11", our strength is large size like above 9" and small size like below 4 3/4".
Different sizes of Heavy weight drill pipe is 3 1/2", 4", 4 1/2", 5", 5 1/2".