... screw;Type "M","UNC","UNF","BSW"threads for Machine threads.Head typesHexagon head,Mushroom head,Pan head,Countersunk ... 22kg-25kg each carton;G.W. for a carton:23 kg-26kg. 3)Carton's Size :34cm*26cm* ... C1022 ,The percent C element is 0.18%-0.23% ,is higher hardness than other.2.Fasteners' Head ... in most of places such as drywall,concrete,chipboard,machine,wood...2) Main export market:North America,South ...