Secondly, we also produce the bench rock drill steel for such as: H25, H28, H32, R32, R39, R46, R52, and it’s all use the material of 23CrNi3Mo(Chromium, Nickel, Molybdenum), this kind of steel material have very good performance parameters, it’s the same material with the international famous brand such as SANDVIC and STLAS etc. During the processing, we also adopt SANDVIK’s processing technique, first, using the continuous casting machine make the round steel bar, then use the depth drill to drill the hole in the middle of the horizontal placed steel bar, then put the mandrel in the hole, heating them, then using the continuous rolling machine to rolling them, finally pull the mandrel out of the steel bar, this kind of processing technique can guarantee smoothness of the endoporus of the rod and also not prone to have the breakage source in the rod.