... hot forging the whole dody Double head bending bar:Experienced in manufacturing the wrenches by hot forging the whole ... ,nickel plated,blackgrades4.8,5.8,6.8,8.8,10.9,12.9widely using forindustries,constructions,electrical,powerspackingsmall boxes,cartons ... . If any questions ,kindly let us know. Double head bending bar