SKD61(H13) steel round bar , with the size ofdia:5.2/5.25/6.2 (bright bar)
dia:7.3/8.3/9.35/10.3/11.3/12.3/13.3514.4/15.3/16.3 (black skinbars)

we could provide the mateial certificate and test the steel bar oneby one ,we are the manufacture in China with good credit reputation, hope could establish long busness relationship wih you