Standard : ASTN B337 ASTM B338
Material : GR1 GR2 GR3 GR4 GR9(3AL-2.5V)
if you need, please contact me ,Ms.Mary Ma . maryma1109(at)yahoo.com S K Y P E : ma_li1021
Material : GR1 GR2 GR3 GR4 GR9(3AL-2.5V)
if you need, please contact me ,Ms.Mary Ma . maryma1109(at)yahoo.com S K Y P E : ma_li1021