1:Swivel Ring Flange 2:1/4" --- 72" 3:150#,300#--2500# ... /S , Alloy Steel 5:Marking as Customer design. Carbon Steel Swivel Ring Flange Type Weld Neck,Slip-On,Blind,Socket Weld ... ,Lap Joint,Threaded,Orifice Flange,Swivel Flange,Spectacle Blind,Etc. Size 1/2"-72"Class 150 ...