... die for square & hexagon screws header punch,pin punch,heading punch rolling die,trimming die,k.o. pin,ejector pin,fingers YuYao zhendajingong Machinery Co.,Ltd ... products of our company are the trimming dies,carbide dies,punch and so on.We improve the life time of our ... set heading dies and forming tools such as 1st punch case, 1st punch pins, main dies, heading die case, spring, feeding roller ...