Product:Ball Valve Seat RetainerForging Type:Free Forging/ Ring RollingMain Production Material:CS: A105N/LF2Alloy: 4130/F 11/F22/F91SS: F304(L)/F316(L)/F321/F347DSS: F51/F53/F55/F60Main Production/Size/Weight Range:1/2"--- 30"