1.Uses:Mainly for building construction,packing and furniture. 2.Material:C1022A Carbon steel 3.peculiarity: Countersunk head 4.Surface treatment：Blue zinc plating，Black phosphate,galvanized,phosphate 5.Length:1/2″-6″,#6-12 Galvanized Blue zinc plating Countersunk head Chipboard screw Fiberboard screw （M4X19MM）are mainly for building construction,packing and furniture.They have Countersunk head.C1022A Carbon steel is used as raw material. This nail is electric galvanizing. According to customer needs can also do phosphate and other surface treatment.It also supports custom packaging, such as boxes, plastic bags and cartons.Please contact us if necessary.