steel grade:J55, K55, N80-1, N80-Q, L80, P110,Q125,13Cr-80,13Cr-110,super13Cr
thread type: NUE,EUE,SC,LTC,BTC.
Surface treatment: surface using phosphate or black finish, painted again.
package: in wooden case, in bundles
type: PIN X PIN, PIN X BOX, According to the drawing process