... ,gr5,gr7,gr9,gr12 2.standard:astm b381,ANSI B16.5,DIN2630-2636,GB/T9116,HG29523 THE DESCRIPTION OF OUR FLANGEitem ... ,ECT.QUALITY CONTROLLultrosonic testing and material quality reportPACKAGEPlywood case line with foam or as your requirementChoose our flange,Choose high quality ... and satisfaction!welcome you to buy our flange.hope cooperate with you!Queen Ti, benefit the world!