Hexagonal Nuts Galvanized Iron sizes: GIN14: ¼ inch GIN38: ⅜ inch GIN12: ½ inch GIN58: ⅝ inch GINM10: M10 GINM12: M12 Stainless Steel 304 sizes: SS14: ¼ inch SS38: ⅜ inch SSN12: ½ inch SSN58: ⅝ inch SSNM10: M10 SSNM12: M12