Extension Pattern Circular BoxExtension Pattern Circular Box: Outer diameter:21.3 ... GB, DIN, ASTMStandard: ASTM A106-2006Grade: 10#-45#, A53-A369Grade: 20#, A53(A,B), A106(B,C)Thickness: 1 - 48 inchSection ... Not: Non-alloyTechnique: SeamlessStandard: ASME, ANSI, ASTMGrade: 20#, Q235Packaging Detail:in bundlesDelivery Detail:20 days -30daysSpecificationsstandard:ASTM ,API5L , DIN, USE:Petroleum, ...