... ,5,8,10, 2H, DH, /8/ 4.Material:Carbon steel,Stainless steel Specification of our nut: 1.NameDIN557 Square Nuts 2. ... ,Heat treatment,etc9.Production Capacity2-3X20'GP/Month10.PackageBulk in carton, small box,then pallet or wooden case11.CertificateISO9001 ... Machining,Heat treatment,etc9.Production Capacity2-3x20'GP/Month10.PackageBulk in carton, small box, then pallet or wooden case11.CertificateISO9001 ...