... .plain , zinc or orthers 4.carbon steel; 1.all kinds of standard nuts such as GB,ISO.DIN.JIS,ANSI,BS ... ,UNI,AS,etc and non-standard nuts;2.size ... 8,false 8.0 ,true 8.0,8.8 and etc;5.material:carbon steel(incude A3#,34#,45#,etc ... zinc plated;white zinc plated;black zinc plated;blue and white zinc platedenvironmental galvanization;HDP;7.manufacture method:be ...