1. Seamless cold rolling precison steel tube 2. with very good tolerance 3 OD size range10~60mm 4 Tolerance is +/-0.1mm We are original manufacturer , we supply tubes with high quality. Our company are produce seamless steel tubes, if any thing I can help you, please contact with me!This is seamless steel tubes’ Features: ItemsSpecificationsStandardGB/TDINASTMGB/T8162-1999, GB/T8163-1999, GB/ ...