... hot forging the whole dody Double head bending bar:Experienced in manufacturing the wrenches by hot forging the whole ... ,high tensile,stailessstandardDIN,ANSI,BSW,AS,JS,ISO,ETC.finishbright,zinc plated,hot-dip galvanized,mechanical plated ,nickel plated,blackgrades4.8 ... . If any questions ,kindly let us know. Double head bending bar