E401-304
E401-304: Stainless Steel Anchorage / 3-15/16" x 3-15/16" x 15/64" for Tube 1 2/3" Dia., Square Wall Plate / Interior (Grade 304)
E401: Stainless Steel Anchorage / 3-15/16" x 3-15/16" x 15/64" for Tube 1 2/3" Dia., Square Wall Plate / Exterior (Grade 316)