... D.G., Black Oxided, Dacromet,Geomet,etc8.Production TechniqueCold forming,Hot forging,Machining,Heat treatment,etc9.Production Capacity2-3X20'GP ... of nuts we can offer?1.NameHex nut, Coupling nut, Nylon lock nut, Spring lock nut, Square nut,Wing nut,etc2.StandardDIN, IFI, ISO, JIS ... box, then pallet or wooden case11.CertificateISO9001:2008Thank you for clicking our product,if you have any interest,pls ...