This square shower drain is made of US ASTM standard 304 stainless steel, base flange is made of PVC construction, certified by CUPC; it Adopts a brushed nickel surface, which effectively resists corrosion, scratches, and rust in daily use, long-lasting durability. Solving ponding problems for bathroom, and pool effectively. Heavy-duty steel covers offer a good sealing ability. The base flange connects to the drain pipe and fits a standard U.S. plumbing connection.