spiral drill collars:
1.Meeting to API7-1
2.OD:3 1/8"-11"
3.Length:5"-31"
Port: qingdao or others
Minimum Order Quantity: 1 Piece/Pieces
Supply Ability: 200 Ton/Tons per Month
Payment Terms: L/C,T/T
Contact SupplierPackaging Detail: bundling
Delivery Detail: according to the request
spiral drill collars
1.Meeting to API7-1
2.OD:3 1/8",3 1/2",4 1/8", 4 3/4",5",6",6 1/4",6 1/2",6 3/4",7",7 1/4",7 3/4",8",81/4",9",91/2",9 3/4",10",11"
3.Length:5"-31"
Drill collars are made of ANSI4137 ,4145H,4145HM alloy steel.