... :DIN,GB,JIS,ANSI,ASME,NON-STANDARDsurface treatment:electro-galvanized,hot dip galvanized,black, plain colorfull,blue-whiterank:4,5,6,8 ... company mainly produces:hex bolts,hex nuts,socket cap bolts,anchor bolts,tower bolts,dorble-headed bolts,galvanized bolts,and a variety of special bolts ,falt washers,spring ...