Square Nut Size: M6--M36 Grade: 4,5,6,8,10,12 Materials: carbon and alloy steel Hot Dip Galvanized Supply ADSS/OPGW ... .D.G., Black Oxided, Dacromet,Geomet,etc8.Production TechniqueCold forming,Hot forging,Machining,Heat treatment,etc9.Production Capacity2-3X20'GP/Month10 ...