1) Sizes: 1/4'' to 24''
2) Standards: ASTM ,JIS,DIN
3) Surface: Oiled or black painted to prevent rust
4) Marking: As per customer's requirement
5)Marking:as customer's requirement
6)Packing: bulk or container
ASTM A 106GRB,A 53, DIN 2448,API 5L standard
Grade:A,B,X42,X52,X60,X70,X80..