1.Name:DIN557 Square Nuts 2.Size: 1/4"-7/8" 3.Grade:Gr. ... :Carbon steel,Stainless steel Specification of our nut: 1.NameDIN557 Square Nuts 2.StandardDIN, IFI, ISO, JIS, AS,BS, EN, SAE ... .NameHex nut, Coupling nut, Nylon lock nut, Spring lock nut, Square nut,Wing nut,etc2.StandardDIN, IFI, ISO, JIS, AS,BS ...