Concentric Reducer: Stainless Steel SS304 Concentric Reducers, ANSI, ISO, JIS and DIN Standard, Wall Thickness Schedule 5-160, 1/2-56 Inch. Type: Concentric Reducer. Materials: Carbon Steel, Stainless Steel SS304, 304L, 321, 316, 316L, 347H, 317L, 310S and 904L. Standards: ANSI, ISO, JIS and DIN. Wall Thickness: SCH 5 - SCH 160. Size: 1/2-56 Inch.