Standard:ASTM Material:Carbon Steel,stainless steel,alloy steel Grade:ASTM A193 B7 B8M A 194 B7M L7 L7M B16 Size:1 4"-3" Surface treatment:Black Oxide,plain,zinc plated,HDG Type:Stud bolt and heavy hex nut Standard:ANSI,DIN,ASTM,GB Thread Type:UNC,UNF,M Advantage:Fast response, good price