... 6.8,8.8,9.8.... SMALL SIZE SCREW,SPECIAL HEAD SCREW,SIZE HEAD SCREW . A good non-standard fastenerS ... threads "A","AB", Threads for chipboard screw,wood screw,drywall screw;Type "M","UNC","UNF","BSW"threads for ... manufacturer with more than 20 years experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench ... used in most of places such as drywall,concrete,chipboard,machine,wood...2) Main export market: ...