Ring nut: Material: steel A3# Certificate: SGS Surface: galvanized, hot dip Size: from 1/4 x2 " to 11/2 x 15" Ring nut: Material: steel A3#Certificate: SGSSurface: galvanized, hot dipSize:1/4 x2 ", 1/4 x 4", 5/16 x2-1/4", 1/16 x 4-1/4", 3/8 x 2-1/2", 3/8 x 4-1/2", 1/2 x 3-1/4", 1/2 x 6", 5/8 x 4", 5/8 x 6", 3/4 X 1-1/4", 3/4 X 6", 7/8 X 5", 1X 6", 1X 9", 11/4 X 8", 11/4 X 12", 11/2 X 15" ring nut ...