Welding Neck Flange, Slip-On Flange, Socket Weld Flange, ScrewedThreaded Flange, Lap Joint flange, OrificeReducing Flange.Sizes:12 - 36", Pressureclasses:from 150lbs to 2, 500lbs, Materials:F316, F304, F316L, F304L, A105, F5, F11, F22, 15CrMo, 12CrMoV, Q235, 16Mn, 20# etc.